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For release on delivery
8:30 a.m. CDT/9:30 a.m. EDT
May 8, 2014

Rethinking the Aims of Prudential Regulation

Remarks by
Daniel K. Tarullo
Member
Board of Governors of the Federal Reserve System
at the
Federal Reserve Bank of Chicago
Bank Structure Conference
Chicago

May 8, 2014

Among the questions posed by the organizers of this 50th Annual Conference on Bank
Structure and Competition is how the “regulatory-supervisory framework has fundamentally
changed.” I think one answer is that the aims and scope of prudential regulation have been
fundamentally redefined since the financial crisis. Most significantly, a concern with financial
stability and an increased emphasis on macroprudential regulation have informed major changes
in both banking law and supervision. This salutary shift in perspective has important
implications for prudential regulation. One is that prudential regulation must deal with threats to
financial stability whether or not those threats emanate from traditional banking organizations.
Hence the need to broaden the perimeter of prudential regulation, both to certain nonbank
financial institutions and to certain activities by all financial actors.
A second implication—to which I will devote most of my remarks this morning—is that
the aims of prudential regulation for traditional banking organizations should vary according to
the size, scope, and range of activities of the organizations. By specifying these aims with more
precision, we can shape both a more effective regulatory system and a more efficient one. That
is, once we have specified the regulatory aims for a particular type of financial institution, we
can more effectively rationalize and, as appropriate, differentiate the rules and requirements to be
applied to each kind of institution.
The Legacy of a Unitary Approach to Bank Regulation
When I was teaching banking law prior to my appointment to the Board of Governors, I
noticed an interesting disconnect in the best casebooks in the field. An introductory chapter on
the history and purposes of bank regulation revealed a complicated set of issues concerning
changes in the structure and activities of banks, which, among other things, suggested that the
rationales for regulating banks might vary depending on the size, business model, and affiliations

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of a bank. Yet the remaining chapters of the casebooks treated bank regulation as a more or less
unitary endeavor—with prudential rules applicable in about the same way to the activities and
affiliations of all banking organizations, and only to banking organizations.
To be sure, topics such as bank affiliations with nonbank financial institutions were, for
practical reasons, more focused on larger banks. And there were a few measures directed at the
more complicated balance sheets of larger banks, such as the Basel II internal ratings-based
(IRB) approach to regulatory capital, although there was no evidence the underlying purpose of
capital regulation differed. But in all the chapters elaborating applicable doctrine and rules, there
was little hint that the purposes and principles of bank regulation might vary across the bank
population. And, to the extent that nonbank financial institutions such as broker-dealers,
investment companies, or insurance companies were covered, the pedagogical point seemed to
be that the aims of regulating these kinds of firms were dominantly investor and customer
protection—not prudential considerations such as limiting moral hazard, much less fostering
financial stability.
The reason for this disconnect was, to a great extent, that pre-crisis statutes and
regulations reflected what I have termed a unitary approach to banking regulation. The core of
banking regulation could be explained with a relatively simple narrative, by which deposit
insurance and access to the discount window had been granted to depository institutions in order
to forestall runs and panics. The resulting moral hazard and the use of insured deposits as a
funding source for these institutions justified everything from capital requirements to limitations
on banks getting into nonbanking businesses. Even when traditional banks were permitted to
affiliate with other kinds of financial firms, laws such as the Bank Holding Company Act1 and

1

Bank Holding Company Act of 1956, as amended, 12 U.S.C. §§1841-1850.

-3-

section 23A of the Federal Reserve Act2 were oriented mostly toward protecting the insured
depository institution and the federal deposit insurance fund (DIF) from possible depredation by
those nonbank businesses. The activities of broker-dealers, for example, were relevant to
prudential regulation only insofar as they affected an affiliated depository institution.
Of course, banking law had not only tried to protect the DIF from the risky activities of
banks and their affiliates. It had also, albeit far less explicitly, tried to protect banks from
nonbank competition and, to some degree, from each other.3 Just as banks were supposed to
stick to their knitting—the business of banking—so everyone else was supposed to stay out of
that business. But as we all know, the distinction between demand for commercial bank loans
and for investment bank underwriting of public debt issuance was never absolute, and in the
1970s it began to erode more rapidly with the growth of capital markets and financial
innovations such as money market funds.
The financial crisis has confirmed that the pre-crisis regulatory structure reflected a view
of the financial system that was at once too broad and too narrow. It was too broad in that
prudential rules generally applied to all banks and bank holding companies through a
microprudential approach focused on the soundness of each individual bank. The rules were
implemented somewhat differently, based on the size and relative complexity of banking
organizations, and separate supervisory portfolios were created. But the principles informing
regulation were basically the same whether the institution was a community bank or a holding
company with a $1 trillion balance sheet whose failure might shake the entire financial system.

2

12 U.S.C. §371c. Section 23A limits transactions between insured depository institutions and their corporate
affiliates.
3
For example, restrictions on branching across state lines and, in some cases, within states limited competition
significantly until they were loosened through statutory changes, such as the Riegle-Neal Interstate Banking &
Branching Efficiency Act, P.L. 103-328 (1994).

-4-

The prudential regulatory structure was too narrow in that it did not extend to firms and
activities outside of banking organizations, even those that could pose a threat to financial
stability, because the soundness of the federal deposit insurance system was not implicated.
Thus Lehman Brothers, whose failure did seriously shake the financial system, was not subject to
even the microprudential standards applicable to bank holding companies. The run on the repo
market involved a wide range of market actors of different sizes, operating under different
regulatory constraints.
Redefining Prudential Regulation
It is important to recognize that the statutory and administrative changes in regulation
following the financial crisis were not only about strengthening existing regulation following 30
years of largely deregulatory measures that had preceded the crisis. The turmoil that attended the
collapse of several large nonbank financial institutions, and the extraordinary government
measures necessary to contain that turmoil, had quickly changed into a consensus—previously
the minority view—that prudential regulation should be broadened to better safeguard the
financial system as a whole. This perspective was embraced by Congress in the Dodd-Frank
Wall Street Reform and Consumer Protection Act (Dodd-Frank), which directed federal banking
and market regulators to add to their existing mandates the responsibility for protecting financial
stability. Dodd-Frank provided numerous new authorities for executing this new mission.
One regulatory innovation in Dodd-Frank that is particularly salient for present purposes
was the creation of different categories of banking organizations—largely, but not exclusively,
on the basis of total assets—to which different regulatory requirements are to apply. Most
prominently, section 165 requires that “in order to prevent or mitigate risks to the financial
stability of the United States,” the Federal Reserve Board is to establish for all bank holding

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companies with at least $50 billion in assets prudential standards that “are more stringent” than
generally applicable standards and that “increase in stringency” based on a variety of factors
related to the systemic importance of these institutions.4 These standards must cover capital,
liquidity, risk management, resolution planning, and concentration limits; the Federal Reserve
may add other standards as it finds appropriate.5 Section 165 also establishes requirements for
the establishment of a risk committee and for stress testing, but these are applicable in at least
some respects to all bank holding companies with at least $10 billion in assets.
In implementing the section 165 requirement of increasing stringency for enhanced
prudential standards applicable to banking organizations of increasing systemic importance, the
Federal Reserve has essentially created several categories within the universe of banking
organizations with $50 billion or more in assets. All firms in this universe will be subject to the
basic enhanced standards, including supervisory stress tests, capital plan submissions, resolution
plan requirements, single counterparty credit limits, and a modified form of the Liquidity
Coverage Ratio (LCR) requirement that was part of Basel III. Firms with at least $250 billion in
assets or $10 billion in on-balance-sheet foreign assets are also subject to the advanced approach
risk-based capital requirements of Basel II, the Basel III supplementary leverage ratio, the full
LCR requirement, and the countercyclical capital buffer provision of Basel III.6 The eight U.S.
firms designated as global systemically important banks will be additionally subject to risk-based
capital surcharges, the enhanced Basel III supplementary leverage ratio, tighter single
counterparty credit limits, and a long-term debt requirement designed to support the
4

Section 165 of Dodd-Frank also requires that these special prudential standards apply to any nonbank financial
company designated as systemically important by the Financial Stability Oversight Council.
5
Dodd-Frank also uses the $50 billion threshold in other parts of the law, such as to define the universe of firms that
must pay the Federal Reserve for the cost of examination and supervision, and that are subject to ex post
assessments in the event that taxpayers were to bear any loss as a result of the resolution of a firm under Title II of
the law.
6
The $250 billion/$10 billion threshold does not appear in Dodd-Frank. It was a pre-existing regulatory category
created to identify the firms subject to the so-called advanced approaches risk-based capital requirements of Basel II.

-6-

effectiveness of orderly resolution processes. In addition, the supervision of these firms is
overseen by the Large Institution Supervision Coordinating Committee (LISCC), an interdisciplinary group created by the Federal Reserve Board in 2010.7
Thus, there are regulatory categories for banks with $10 billion or more in assets, with
$50 billion in assets, with either $250 billion in assets or $10 billion in foreign assets, and with a
combination of large asset holdings and other characteristics that have resulted in their being
designated of global systemic importance. In fact, Dodd-Frank creates another category of banks
in making its provision on incentive compensation applicable to banking organizations with at
least $1 billion in assets. Clearly, the unitary approach of the pre-crisis period has been
abandoned. This is an important move in the right direction. But in terms of differentiating
regulatory aims, Dodd-Frank really identifies only one additional objective—that of preventing
or mitigating risks to U.S. financial stability. By developing this objective a bit more, and by
introducing other salient considerations, we may be able to specify the varying aims of
regulation for different kinds of banks in a manner that helps us rationalize applicable regulatory
structures.
Specifying Regulatory Aims
Let me begin with what I regard as relatively straightforward cases in specifying
regulatory aims—those of the very largest banking organizations and of small ones. The largest,
of course, have commanded enormous attention, with too-big-to-fail concerns often dominating
the public debate on regulatory reform in the aftermath of the financial crisis. There is now a
consensus among banking authorities, both U.S. and foreign, that the failure of financial

7

For more on LISCC, including which firms are part of the LISCC portfolio, see
www.federalreserve.gov/bankinforeg/large-institution-supervision.htm.

-7-

institutions of sufficient combined size, interconnectedness, and leverage could threaten the
entire financial system, and, therefore, must be subject to a stricter regulatory regime.
The special regulatory aims for such institutions should reflect this systemic focus. The
very large negative externalities associated with such failures could be realized through a classic
domino effect or through contagion effects. As the financial crisis showed, losses in a tail event
are likely to be correlated for large firms deeply engaged in trading, structured products, and
other capital market instruments, and relying on similar sources of short-term funding. Thus, the
regulatory framework should aim to reduce the chances of distress or failure at such firms to a
greater extent than traditional, microprudential regulation would. Moreover, it should explicitly
take into account the correlations and inter-dependencies in asset holdings and funding. Finally,
the regulatory system should aim to offset the perception of too-big-to-fail status, which carries
with it the possibility of funding advantages in normal times, and protection of creditors and
perhaps even shareholders in highly stressed times. The systemic perspective and consequent
aim of protecting financial stability argue for the stronger and broader regulatory measures that
have been undertaken in recent years.
At the other end of the spectrum are community banks, conventionally defined as those
with less than $10 billion in assets. The roughly 5,700 banks in this group constitute 98 percent
of insured commercial banks in the United States, but hold just under 20 percent of the aggregate
assets of all commercial banks. Indeed, 90 percent of community banks are what supervisors
classify as “small” community banks—those with less than $1 billion in assets. While these
banks will suffer the fallout from systemic problems, they are unlikely to cause such problems.
The regulatory aim, therefore, is about as close as can be to the traditional microprudential bank
regulatory aims of protecting the federal DIF and limiting the use of insured deposits by

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restricting the scope of bank activities. It is true that the relative lack of geographic and portfolio
diversification in many community banks can make them vulnerable to localized economic
problems. But that is just the kind of problem that traditional microprudential regulation has
been concerned with addressing.
What, then, of the 80 or so U.S. banks that have assets of $10 billion or more, but are not
among the eight large, complex institutions that have been designated of global systemic
importance? Obviously they vary enormously in size, from just over $10 billion in assets all the
way up to very large regional banks with hundreds of billions in assets. They bridge the $50
billion threshold for enhanced prudential standards established by Dodd-Frank. Yet, whatever
their size, most banking organizations in this group are overwhelmingly recognizable as
traditional commercial banks (though a few do have significant capital market or other
activities).
It is with this similarity in mind that some executives of some pretty sizable banks have
described their institutions to me as essentially a community bank, but with a bigger balance
sheet. But there are at least two reasons why the aims for prudential regulation of such
institutions might reach beyond conventional microprudential purposes. First, some at the higher
end of this range may have a large enough systemic footprint that their stress or failure could
have material effects on the rest of the financial system, though less than the LISCC firms.
Second, more than one-third of U.S. commercial banking assets are held by these 80 banks. If a
number of these banks simultaneously came under pressure or failed, a harmful contraction of
credit availability in significant regions or sectors of the economy could ensue, even if there were
little chance of a financial crisis. Thus, particularly to the degree that there are correlations in the

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risks associated with loans held across such institutions, there should be a macroprudential
objective in the regulation of at least some of these firms.
Of course, I would not lump all 80 of these institutions into the same category for
purposes of specifying the aims of regulation. In particular, only a small fraction of these firms
have a significant enough systemic footprint that their stress or failure would impose sizable
negative externalities on the rest of the financial system. And the lines delineating the possible
categories are not as easy to draw as for community banks and LISCC firms. Nonetheless, I will
suggest in a few moments some possible classifications for this group of banks, along with
examples of the varying regulations that might apply.
Rationalizing the Regulatory Framework
The preceding observations have portrayed the prudential regulatory framework as one
that should be constructed with different aims in mind. With respect to all depository
institutions, this framework maintains the traditional aim of protecting the DIF and limiting the
use of insured deposits to engage in nonbank activities. With respect to banks of a certain size—
even those predominantly involved in conventional lending activities—a macroprudential aim
should be added. Finally, with respect to banking organizations of such size and complexity that
serious stress or failure could pose risks to the entire financial system, a financial stability aim
should be the basis for additional forms of regulation. As suggested in section 165 of DoddFrank, the stringency of these additional regulations should increase in proportion to the systemic
importance of the banking organizations.
Let me now give a few examples of how specifying these aims can help us think through
ways in which the current overlays of regulatory and supervisory requirements might be
rationalized. In part, such a rationalization is motivated by the familiar goal of limiting

- 10 -

regulatory costs that are not necessary to achieve a given set of regulatory aims, thereby lowering
the cost of the underlying economic activity. But it is also motivated by the advantage to be
gained if supervisory resources can be deployed where their payoff in achieving well-specified
regulatory aims will be highest.
Community banks. I will begin again with community banks. Community bankers often
argue that they are subject to a range of rules and requirements that are not really necessary
given the relevant regulatory aim which, as previously suggested, is quite straightforward. That
regulatory aim needs to be implemented with an eye to the context in which community banks
operate. One obvious point of context is that any regulatory requirement is likely to be
disproportionately costly for community banks, since the fixed costs associated with compliance
must be spread over a smaller base of assets.
A second important point of context is the business model of community banks. As is
well-known, over the past few decades they have substantially reduced their presence in lines of
business such as consumer lending in the face of competition from larger banks benefiting from
economies of scale. Today, as a group, their most important forms of lending are to small- and
medium-sized businesses. Smaller community banks—those with less than $1 billion in assets—
account for nearly a quarter of commercial and industrial lending, and nearly 40 percent of
commercial real estate lending, to small- and medium-sized businesses, despite their having less
than 10 percent of total commercial banking assets.
This state of affairs is not surprising when one considers that credit extension to smaller
firms is an area in which the relationship lending model of community banks retains a
comparative advantage. It means that community banks are of special significance to local
economies. It also means that, particularly in rural areas, the disappearance of community banks

- 11 -

could augur a permanent falloff in this kind of credit, at least a portion of which may not be
maintained in the more standardized approach to lending characteristic of larger banks.
Banking regulators have taken a number of steps to try to avoid unnecessary regulatory
costs for community banks, such as fashioning simpler compliance requirements and identifying
which provisions of new regulations are of relevance to smaller banks. But a number of new
statutory provisions apply explicitly to some smaller banks or, by failing to exclude any banks
from coverage, apply to all banks. This means that smaller banks do need to expend at least
some compliance effort. And, even where regulatory frameworks try to place a lesser burden on
smaller banks, there may be some risk of “supervisory trickle down,” whereby supervisors
informally, and perhaps not wholly intentionally, create compliance expectations for smaller
banks that resemble expectations created for larger institutions.
It would be worthwhile to have a policy discussion of statutes that might be amended
explicitly to exclude community banks (which, again, are generally defined as those with less
than $10 billion in assets) from their coverage. In my view, two candidates would be the
Volcker rule and the incentive compensation requirements in section 956 of Dodd-Frank. The
concerns addressed by these statutory provisions are substantially greater at larger institutions
and, even where a practice at a smaller bank might raise concerns, the supervisory process
remains available to address what would likely be unusual circumstances. Indeed, relieving both
banks and supervisors of the need to focus on formal compliance with a range of regulations less
relevant to community bank practice would free them to focus on the actual problems that may
exist at smaller banks.
Middle-range banks. As I have already suggested, financial stability and
macroprudential aims do not apply equally to all 80 of the banks in this wide category of firms

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holding over $10 billion in assets, other than the LISCC banking organizations. While it is
reasonable to adopt a macroprudential aim for all firms in this category, few of these banks have
the kind of systemic footprint that would warrant extensive special regulation for financial
stability purposes. In establishing requirements for firm (though not supervisory) stress testing
and risk-management committees for all bank holding companies in this group, but mandating
that only bank holding companies of $50 billion or more be subject to enhanced prudential
standards, Congress has reflected a similar judgment. The key question is whether $50 billion is
the right line to have drawn.
Experience to date suggests to me, at least, that the line might better be drawn at a higher
asset level—$100 billion, perhaps. Requirements such as resolution planning and the quite
elaborate requirements of our supervisory stress testing process do not seem to me to be
necessary for banks between $50 billion and $100 billion in assets. If the line were redrawn at a
higher figure, we might explore simpler methods for promoting macroprudential aims with
respect to banks above $10 billion in assets but below the new threshold.
Were such a change to be adopted, bank holding companies with less than $100 billion in
assets would not be subject to any of the enhanced prudential requirements of section 165 of
Dodd-Frank; bank holding companies with assets between $100 billion and $250 billion would
be subject to supervisory stress testing and a basic set of the section 165 requirements; and
holding companies with $250 billion or more in assets would be subject to the supplementary
leverage ratio, the full LCR, and the countercyclical capital buffer provision. Of course, this is
not the only way to draw the lines, and there could be reasons for applying additional
requirements to specific banks, even if they fall below the presumptive asset threshold. But I use

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this example to illustrate how the specification of aims and the progressive stringency of section
165 could be usefully combined.
Largest institutions. Specifying prudential regulatory aims in the context of community
and middle-range banks suggests a rationalization that could possibly eliminate certain
requirements as they apply to some of these banks. In the case of the LISCC institutions,
however, I believe there are additional requirements needed to implement prudential aims
associated with financial stability. These include capital surcharges and minimum amounts of
“gone concern” loss absorbing capacity, among others. Most important is continued work on the
vulnerabilities posed by short-term wholesale funding and, more generally, by large trading
books, including maturity matched books of securities financing transactions. The regulatory
response to these vulnerabilities will likely require some combination of measures directed at
capital, liquidity requirements, and resolution procedures. There is also a need for a
complementary set of measures such as minimum margining requirements applicable to all
securities financing transactions, whether or not they involve systemically important firms.
But there are some opportunities for rationalization even with respect to regulation of the
larger institutions. While necessary new rules will now be applied to these institutions, vestiges
of the pre-crisis regulatory approach that did not rest on well-specified regulatory aims are still in
place and might sensibly be modified or removed. Most prominent in this regard is the Basel II
IRB approach for risk-weighted capital requirements. The IRB approach, which generally
applies in the United States to all bank holding companies with $250 billion or more in assets,
was developed a decade ago in an effort to align risk weightings more closely to the increasingly
sophisticated quantitative risk-assessment techniques in the financial industry.

- 14 -

At the time of its development, the IRB approach seemed intended to result in a modest
decline in risk-weighted capital requirements, a goal that the financial crisis revealed to be badly
misguided. But even with the higher capital ratios required by Basel III, the IRB approach is
problematic. The combined complexity and opacity of risk weights generated by each banking
organization for purposes of its regulatory capital requirement create manifold risks of gaming,
mistake, and monitoring difficulty. The IRB approach contributes little to market understanding
of large banks’ balance sheets, and thus fails to strengthen market discipline. And the relatively
short, backward-looking basis for generating risk weights makes the resulting capital standards
likely to be excessively pro-cyclical and insufficiently sensitive to tail risk. That is, the IRB
approach—for all its complexity and expense—does not do a very good job of advancing the
financial stability and macroprudential aims of prudential regulation. Yet a capital measure that
incorporates these aims is precisely what is needed to complement the traditional
microprudential elements of our capital standards.
The supervisory stress tests developed by the Federal Reserve over the past five years
provide a much better risk-sensitive basis for setting minimum capital requirements. They do
not rely on firms’ own loss estimates. They are based on adverse scenarios that would affect the
entire economy and take correlated asset holdings into account. As we gain experience, we have
been enhancing the macroprudential features of the annual stress test exercise. And, of course,
the disclosure of the results helps inform counterparties and investors, thereby increasing market
discipline. They are undoubtedly a substantial amount of work for both the banks and
supervisors but, unlike the IRB approach, the benefits seem worth the work.8

8

Under the Federal Reserve’s Comprehensive Capital Analysis and Review program, bank holding companies
participating in the supervisory stress tests must demonstrate their capacity for sound quantitative risk assessment
and management, but not for purposes of setting regulatory capital requirements.

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For all these reasons, I believe we should consider discarding the IRB approach to riskweighted capital requirements. With the Collins Amendment9 providing a standardized,
statutory floor for risk-based capital; the enhanced supplementary leverage ratio providing a
stronger back-up capital measure; and the stress tests providing a better risk-sensitive measure
that incorporates a macroprudential dimension, the IRB approach has little useful role to play.
We would continue to expect that firms practice sound quantitative risk management using
internal models and other techniques. Indeed, the qualitative assessment included in our annual
Comprehensive Capital Analysis and Review (CCAR) exercise is designed to ensure that the
firms have this capacity. But, in light of all that has happened in the last decade, I see little
reason to maintain the requirements of the IRB approach for our largest banks.
Of course, the IRB approach was agreed internationally as part of the Basel II framework
concluded in 2004. It would be best if all the Basel Committee countries moved together to
adopt standardized risk-weighted and supervisory stress testing requirements for all
internationally active banks. This would be a somewhat complicated shift for a number of
reasons, including the likely appropriateness of applying different adverse scenarios for different
parts of the world and the challenges in conducting a peer review at the Basel Committee of
supervisory stress tests by member countries. Yet, as documented by the Basel Committee’s
work on divergence in risk weightings by banks applying IRB methods, Basel II created its own
problems of consistency and transparency. There is no reason to believe that the task of creating
an oversight and review framework for supervisory stress testing would be any more difficult.

9

Section 171 of Dodd-Frank, popularly known as the Collins Amendment, requires that the federal banking
agencies establish minimum consolidated capital requirements for all banking organizations that are not less than
“generally applicable” risk-based capital requirements.

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Conclusion
In practical terms, the unitary approach to banking regulation has been supplanted by
various statutory, regulatory, and supervisory responses to the financial crisis. In particular, the
aim of protecting financial stability has figured prominently in those responses, though a broader
macroprudential aim can be detected as well. I have tried today to suggest that an explicit effort
to specify relevant aims as they pertain to different kinds of banking organizations can provide a
basis for rationalizing applicable regulatory frameworks—sometimes by paring back or
foregoing regulation for certain kinds of firms, and sometimes by adding a regulatory measure
where the relevant aim has not been adequately promoted by existing measures.
By design and necessity, I have offered only a handful of illustrations as to how this
perspective might lead to certain regulatory changes. I look forward to debate on the merits of
these, and other, possible implications of a more precise specification of prudential regulatory
aims. I also look forward to seeing new editions of banking law casebooks that differentiate
regulatory measures with an eye to these multiple aims and their differential application to
various banking organizations.