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February 2014, EB14-02

Economic Brief
Reforming Money Market Mutual Funds:
A Difficult Assignment
By Huberto M. Ennis and Renee Haltom

The money market mutual fund (MMMF) industry was one of many
segments of the financial sector that experienced significant volatility
during the 2007–08 financial crisis. Reform efforts have been underway
to make the industry more resilient to shocks, but proposals have been
controversial. This Economic Brief explores some of the key issues and
sheds light on why reforming this industry has been so challenging.
Money market mutual funds (MMMFs) were
among many investment vehicles that experienced volatility during the 2007–08 financial crisis. Like many financial markets during the crisis,
large numbers of investors rapidly withdrew from
these funds, and the U.S. government, through
the Federal Reserve and the Treasury Department, extended extraordinary support. And like
many other investment vehicles, MMMFs have
been the focus of reform efforts since the crisis to
make the industry more resilient.
But unlike many other segments of the financial
sector, major reforms for MMMFs have not yet
been passed. (The 2010 Dodd-Frank Act did
not directly address the MMMF industry.) This
is partly because proposed reforms have been
controversial and regulators have failed to agree
on the best path. This Economic Brief explores
some of the key issues of MMMF reform and
helps explain why reforming this industry has
been so difficult.
MMMF Basics
To better understand certain events during the
financial crisis and reform efforts after the crisis,
it is useful to review some basic facts about the
MMMF industry.

EB14-02 - Federal Reserve Bank of Richmond

MMMFs act as intermediaries between investors
seeking highly liquid, safe investments and a
variety of corporate and government entities that
issue short-term debt to fund operations. There
are three types of MMMFs, and only one of them
experienced major problems during the crisis.
“Prime” funds invest primarily in private credit
instruments, and they experienced significant
volatility in late 2008 after suffering losses on
these investments. The other two types—government MMMFs, which invest in U.S. Treasury
and agency securities, and tax-exempt funds,
which invest in state and local government securities—did not experience trouble during the
crisis. In terms of assets under management,
prime funds accounted for $2.1 trillion of the $3.5
trillion MMMF industry on September 10, 2008.1
The core feature of MMMFs is that investments
are predominantly open-ended, and investors
can withdraw funds at any time by cashing in
their shares, generally at a constant price of
$1.00 per share. Rule 2a-7 of the Securities and
Exchange Commission (SEC), which regulates
MMMFs, allows the funds to value their portfolios
based on the fund’s acquisition cost rather than
based on the current market value of those assets as long as the former is not too far from the

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latter. What this means in practice is that the funds
can value shares at $1.00, but they must periodically
calculate the market value of the portfolio, and if
the market value, or “shadow” net asset value (NAV)
per share falls below $0.995, the fund’s board must
decide whether or not to lower the share price, which
is called “breaking the buck.” To reduce the likelihood
that the shadow value will fall below $1.00, funds are
subject to certain risk-limiting conditions, such as
maturity and credit-quality restrictions.

assets. The secondary market for these instruments
can be thin, however, and MMMFs tend to hold a
significant share of the market; for example, MMMFs
held 45 percent of all outstanding commercial paper
as of September 2008.3 As a result of outflows experienced after Lehman’s failure, MMMFs’ purchases
of new securities in short-term funding markets fell
abruptly. These events threatened to restrict funding
for a wide array of institutions that rely on short-term
borrowing to fund operations.

The constant share value is intended to help customers, especially smaller investors, manage their cash
holdings. It is based on the assumption that a pool
of high-quality, short-term investments will deliver
its expected return if held until maturity. However, if
MMMF shareholders suspect that the fund will break
the buck, they have incentive to withdraw their funds
before the price is reduced. As investors rush to be
first in line, the fund may be forced to sell assets to
meet redemptions, potentially increasing the likelihood that the fund will actually break the buck. Even
though the direct effects of breaking the buck are
not necessarily great—since the share price may fall
by as little as 5 percent of one penny—investors face
a “first mover” advantage because only early withdrawers will receive the full share price, concentrating
losses on the remaining shareholders. This can lead to
a rush to withdraw funds, a so-called “run.”

In response, government agencies announced two
emergency programs on September 19. The Fed established the Asset-Backed Commercial Paper Money
Market Mutual Fund Liquidity Facility (AMLF), which
allowed the Fed to make direct loans to depository
institutions and bank holding companies that were
buying commercial paper from mutual funds.4 The
intended effects were twofold: to help credit flow to
asset-backed commercial paper issuers, and to provide a market for the commercial paper that MMMFs
sought to sell, helping them to meet redemptions.5
In addition, the U.S. Treasury announced a blanket
guarantee of the $1.00 NAV per share for eligible
MMMFs.6 Outflows from MMMFs slowed in the weeks
after these programs were announced, but the funds
did continue to divest large amounts of commercial
paper and other assets for some time.

During the Crisis
A wave of redemptions occurred after Lehman Brothers announced on September 14, 2008, that it would
file for bankruptcy protection the next day. There was
a massive outflow of funds from prime MMMFs over
the next two days, including more than $40 billion in
redemption requests from the Reserve Primary Fund,
a $62.5 billion prime MMMF that held $785 million in
Lehman debt. On September 16, the Reserve Primary
Fund became only the second prime fund to ever
break the buck, the first since 1994. Outflows from
prime funds then accelerated significantly. Within a
week, institutional investors withdrew roughly $321
billion, or 16 percent of prime funds’ total assets.2
A natural way for prime funds to meet the high volume of redemptions would be to sell some of their

Many prime funds also received private support from
“sponsors.” A sponsor in this context is an affiliated
company—often the fund’s asset management firm
or parent company—that has an interest in avoiding the reputational damage of the MMMF’s forced
liquidation. During the crisis, sponsors gave cash or
purchased securities from MMMFs at above-market
prices. According to a report by the Federal Reserve
Bank of Boston, sponsors provided over $4.4 billion
in support to 78 MMMFs (out of 341 funds reviewed)
between 2007 and 2011.7 Some sponsors also provided contractual backstops that were not drawn
upon but arguably helped funds to avoid breaking
the buck.
Since the Crisis
Since 2008, there have been multiple efforts to make
the industry more resilient to sudden waves of with-

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drawals, but these efforts have been controversial.
On February 23, 2010, the SEC implemented a new
set of rules for MMMFs.8 These rules tightened restrictions on funds’ risk-taking by imposing additional
credit-quality standards, shortening the average maturity of funds’ portfolios, and introducing, for the first
time, the requirement that funds hold a minimum
percentage of assets in highly liquid securities. The
rule change also permitted a fund’s board of directors to suspend redemptions when losses threaten to
break the buck, a move that necessarily would result
in liquidation of the fund. (Previously, funds had to
get permission from the SEC to suspend redemptions.) The rule also enhanced funds’ information
disclosures, among other things.
The SEC explicitly noted in this rulemaking that the
newly introduced rules were only a first step. In particular, they did not completely remove the possibility
of runs created by the constant share value.
In November 2010, the SEC requested public comment on a long list of structural reforms proposed by
the President’s Working Group to make the industry
less vulnerable to runs.9 In August 2012, the SEC announced that its commissioners had failed to reach
agreement on these reforms, and thus it would not
proceed with a vote to solicit public comment on
new proposed rules.10
Under section 120 of the Dodd-Frank Act, the newly
established Financial Stability Oversight Council
(FSOC) may recommend to a financial regulatory
agency that it adopt stricter regulation of any
financial product or practice if the FSOC believes its
conduct, scope, nature, size, scale, concentration, or
interconnectedness poses risks to financial stability.
Under the law, the agency in question must either
implement the recommendation or explain in writing why it has not done so, and these steps must be
reported to Congress. On September 27, 2012, thenTreasury Secretary Timothy Geithner, serving in that
position’s capacity as FSOC chairman, wrote a letter
to FSOC members urging them to act on section 120
by seeking public comment on reforms to the MMMF
industry and providing a recommendation to the
SEC.11 If the SEC were to fail to implement reforms,

he urged the FSOC to consider other options, such
as whether aspects of, or institutions in, the MMMF
industry should be designated as “systemically important” under Title I of the Dodd-Frank Act, which
would subject such firms to both higher prudential
standards and supervision by the Fed.
On November 19, 2012, the FSOC sought public comment on three alternatives: (1) permanent elimination of the constant $1.00 share price, meaning all
redemptions would take place at the market value of
the portfolio (floating NAV) as is done for other types
of mutual funds; (2) preserving the stable NAV, but
requiring funds to hold an asset buffer equal to 1 percent of the NAV to help absorb credit losses. Simultaneously, a small percentage of large investors’ shares
would be available for redemption only after a delay,
a provision known as “minimum balance at risk;” and
(3) maintaining the stable NAV and requiring MMMFs
to hold an asset buffer equal to 3 percent of the NAV
to help absorb credit losses.12
The SEC subsequently indicated that it would not
pursue the latter two options because of its judgment
that doing so might result in a greater contraction of
the MMMF industry than other acceptable proposals.
On June 5, 2013, the SEC sought comment on two
proposals: (1) a floating NAV, and (2) a stable NAV
combined with two measures intended to limit runs.
Those measures would allow funds to impose fees on
redemptions if liquidity fell below a certain threshold
and would allow funds to temporarily suspend redemptions—known as redemption “gates”—if a certain amount of redemptions already had occurred.13
Understanding Proposed Reforms
Every major reform proposal has emphasized the
incentives to run created by the constant $1.00 share
price, and every major reform proposal has included
a floating NAV as one option.
If shareholder redemptions were paid based on the
current market value of shares, there would be much
less value in rushing to be first in line because there
would be no event (breaking the buck) to beat. Under
a floating NAV, the redemptions that do occur are
more likely to be because investors have a consump-

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tion need or see a better investment opportunity
elsewhere. The floating NAV option is considered
further in the final section of this Economic Brief.
Historically, the funds have had no explicit way to absorb losses such as the large write-downs imposed by
Lehman’s bankruptcy. Sponsor support has provided
one way to deal with losses—according to the Boston
Fed analysis, at least 31 funds would have broken the
buck without sponsor support between 2007 and
2011—but to the extent that this support is discretionary, it is not enough to reliably prevent runs.
Thus, alternatives to the floating NAV have included
preserving the stable NAV, but with the requirement
that funds adopt capital buffers.14 Capital buffers
would help funds absorb losses and could therefore
make runs less likely. But they are only sufficient to
prevent runs if investors judge that the buffer is large
enough to absorb potential losses. So setting the
right buffer would require regulators to understand
how investors form expectations about the viability
of the funds, which would be difficult. Furthermore,
because capital is often considered costly, there is a
natural tendency to set capital requirements potentially too low. This is especially true after long periods
without a crisis when the benefits of high capital
buffers become less apparent. Moreover, capital buffers in a regime of stable NAVs do not eradicate the
“cliff” effect that provides the incentive for runs. Even
if withdrawing investors are forced to sacrifice part of
their investment (as in the “minimum balance at risk”
clause that the FSOC proposed in November 2012),
they would still likely do so if they perceive that losses
could exceed the relinquished amount.
A relevant question is why funds don’t adopt some of
these safeguards on their own. One possibility is that
funds and investors expect that if run-like conditions
developed, the government likely would intervene to
prevent firms from breaking the buck, as the Fed and
the Treasury did during the crisis. Funds may perceive
little reputational risk from accepting government
help because run-like conditions are likely to affect a
number of funds at once. To the extent that government support is expected, funds have less incentive
to structure themselves in ways that would help them

absorb losses or prevent runs. In fact, the expectation
of government support itself increases the likelihood
of runs because, by transferring losses from fund
shareholders to taxpayers, it encourages risk-taking.
Another way to deal with the possibility of runs
would be to impose redemption gates, as proposed
by the SEC last year. The idea behind gates is similar
to partial suspension of convertibility from deposits
to cash in the famous Diamond-Dybvig model of
bank runs.15 In that model, depositors who don’t truly
need their funds know that suspension will stop the
run before the bank’s assets are depleted, so they are
content to stay invested. However, if the gates are
not appropriately set or are not credible, then gates
could exacerbate runs by increasing the incentives
for investors to get out before the gates are invoked.
Moreover, if the ability to suspend is accompanied by
liquidation (as in the provisions adopted by the SEC
in February 2010) and liquidation imposes costs on
the fund that reduce the return to investors, then investors may rush to exit before suspension is invoked.
Floating NAVs
Though a floating NAV probably has received more
combined support than any other proposal, there are
evident challenges in implementing it.16
Floating NAVs are likely to be opposed by certain
groups because they tend to increase the funding
costs of the MMMF industry. However, some of this
could be appropriate. MMMFs historically have bypassed the regulations that banks face—designed to
limit moral hazard from government support through
deposit insurance and access to Fed credit—because
the funds did not benefit from explicit government
support. After the financial crisis, the assumption
that MMMFs don’t benefit from an implicit government guarantee is no longer appropriate. Unless the
government can credibly commit to not providing
support, which would seem difficult given the events
of September 2008, the funds’ costs ought to rise.
Another possible objection to a floating NAV is that
it could negate the economic function that MMMFs
perform. But whether that is true depends on one’s
assessment of what that function is. Prime funds

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could be seen as performing one of at least two
possible functions. One is that they provide maturity
transformation services to investors. Even though
MMMFs generally invest in short-term securities that
satisfy a maximum maturity requirement, investors
in MMMFs often include corporations looking for an
interest-bearing, extremely short-term, liquid, and
safe place to park cash used for operating expenses.
Thus, there can be a maturity mismatch involved
with MMMF operations. An alternative to the maturity transformation function is that the funds serve
primarily as expert managers of relatively short-term
money market instruments.
One of the authors of this Economic Brief (Ennis) explored those functions theoretically, and their implications for setting of the NAV, in a recent paper.17 He
first considers the maturity transformation case. The
main objective of an investment vehicle that offers
demandable claims and maturity transformation services is that it provides a type of liquidity insurance to
the investor. In other words, the investor can engage
in longer-term investments (and the higher returns
generally associated with them) but can access his
funds on demand if the need to employ those funds
elsewhere arises. This liquidity insurance is possible
because only a portion of investors in the fund is expected to withdraw at any given time. If, on the other
hand, everyone were to withdraw at once, the fund
would be unable to meet all redemptions, creating
the conditions for a self-fulfilling run on the fund, as
modeled by Diamond and Dybvig.
The redemption value that an investor receives must
take this insurance feature into account. A value that
is too high—that is, not reflecting the current market
value of an investment that is not yet mature—may
not leave enough funds for the remaining investors,
thus retaining the incentive for runs. A redemption
value that is too low—reflecting the current market
value—may negate the value of the liquidity insurance that the fund is supposed to provide (in the
same way that narrow banking undermines maturity
transformation banking). There is a tradeoff, then,
between the insurance feature and stability: trying to
completely rule out instability may uproot all potential benefits from maturity transformation.

Alternatively, suppose that MMMFs are cash managers and perform little or no maturity transformation
services. The Diamond-Dybvig model of runs, which
centers on maturity transformation, no longer applies. If the NAV is purely floating, the redemptions
that do occur can be efficient because they are due
to needs to reallocate resources to better uses. In this
framework, delays in adjusting NAVs to the appropriate value could produce the run-like behavior that
occurred in 2008. Furthermore, limiting the ability
of investors to withdraw from troubled funds could
prevent the efficient reallocation of resources.
Note the difference between the maturity transformation case and the investment manager case. In
the former, a fully floating NAV produces stability,
but negates the maturity transformation function of
MMMFs. In the latter, a floating NAV enhances stability and efficiency.
Of course, MMMFs may be performing both functions at the same time, along with other functions.
How much of each they are doing is ultimately an
empirical question. Calculating efficiency-enhancing
redemption values thus is not always straightforward.
More generally, after taking a stand on the functions
performed by MMMFs, well-understood theoretical concepts can guide the design of an appropriate
regulatory framework.
Huberto M. Ennis is a research advisor and
economist, and Renee Haltom is an economics
writer in the Research Department at the Federal
Reserve Bank of Richmond.
Endnotes
1

F or a more detailed summary of events during the financial crisis, see Duygan-Bump, Burcu, Patrick Parkinson, Eric Rosengren,
Gustavo A. Suarez, and Paul Willen, “How Effective Were the
Federal Reserve Emergency Liquidity Facilities? Evidence from
the Asset-Backed Commercial Paper Money Market Mutual
Fund Liquidity Facility,” Journal of Finance, April 2013, vol. 68,
no. 2, pp. 715–737.

2

Data from iMoneyNet.

3

Duygan-Bump, et al., April 2013.

4

F ederal Reserve Board of Governors press release,
September 19, 2008.

5

To provide direct support to commercial paper issuers, the Fed
also announced the Commercial Paper Funding Facility (CPFF)
on October 7, 2008.

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6

See “Treasury Announces Guaranty Program for Money Market
Funds,” Treasury Department press release, September 19, 2008.

7

Brady, Steffanie A., Ken E. Anadu, and Nathaniel R. Cooper, “The
Stability of Prime Money Market Mutual Funds: Sponsor Support
from 2007 to 2011,” Federal Reserve Bank of Boston Risk and
Policy Analysis Unit, Working Paper No. RPA 12-3, August 2012.

8

S ee “SEC Approves Money Market Fund Reforms to Better
Protect Investors,” SEC press release, January 27, 2010.

9

T he President’s Working Group was a precursor to the FSOC created by the 2010 Dodd-Frank Act. It was composed of the secretary of the Treasury, the chairman of the Federal Reserve Board
of Governors, the chairman of the SEC, and the chairman of
the Commodity Futures Trading Commission. See “Report of
the President’s Working Group on Financial Markets: Money
Market Fund Reform Options,” October 2010.

10

S ee “Statement of SEC Chairman Mary L. Schapiro on Money
Market Fund Reform,” SEC press release, August 22, 2012.

11

See letter from Timothy F. Geithner, secretary of the Treasury,
to members of the FSOC, September 27, 2012.

12

See “Proposed Recommendations Regarding Money Market
Mutual Fund Reform,” Federal Register, vol. 77, no. 223, November 19, 2012, pp. 69455–69483. For a discussion of minimum
balance at risk, see McCabe, Patrick E., Marco Cipriani, Michael
Holscher, and Antoine Martin, “The Minimum Balance at Risk:
A Proposal to Mitigate the Systemic Risks Posed by Money
Market Funds,” Federal Reserve Bank of New York Staff Reports,
No. 564, July 2012.

13

See “SEC Proposes Money Market Fund Reforms,” SEC press
release, June 5, 2013.

14

T he proposals discussed above consider that MMMFs could be
given a choice between a floating NAV and a stable NAV combined with other safeguards.

15

Diamond, Douglas W., and Philip H. Dybvig, “Bank Runs,
Deposit Insurance, and Liquidity,” Journal of Political Economy,
June 1983, vol. 91, no. 3, pp. 401–419.

16

For example, two comment letters, one to the FSOC and one
to the SEC, both signed by all 12 Reserve Bank presidents,
endorsed the floating NAV option while raising concerns
about the other options.

17

E nnis, Huberto M., “Some Theoretical Considerations Regarding Net Asset Values for Money Market Mutual Funds,” Federal
Reserve Bank of Richmond Economic Quarterly, Fourth Quarter
2012, vol. 98, no. 4, pp. 231–254.

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Federal Reserve Bank of Richmond, and include the
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Views expressed in this article are those of the authors
and not necessarily those of the Federal Reserve Bank
of Richmond or the Federal Reserve System.

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