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Working Paper 8609 http://clevelandfed.org/research/workpaper Best available copy THE USE OF MARKET INFORMATION I N PRICING DEPOSIT INSURANCE by James B. Thomson James B. Thomson i s an economist a t t h e Federal Reserve Bank o f Cleveland. The a u t h o r thanks Ed Kane, Andy Chen, E r i c Rosengren, and t h e r e f e r e e s of t h e Journal o f Money, C r e d i t and Banking f o r h e l p f u l comments on an e a r l i e r v e r s i o n of t h i s paper. Working papers o f t h e Federal Reserve Bank o f Cleveland are p r e l i m i n a r y m a t e r i a l s , c i r c u l a t e d t o s t i m u l a t e d i s c u s s i o n and c r i t i c a l comment. The views s t a t e d h e r e i n a r e t h e a u t h o r ' s and n o t n e c e s s a r i l y those o f t h e Federal Reserve Bank of Cleveland o r o f t h e Board o f Governors o f t h e Federal Reserve System. August 1986 Federal Reserve Bank o f C l e v e l a n d http://clevelandfed.org/research/workpaper Best available copy The Use o f Market I n f o r m a t i o n i n P r i c i n g D e p o s i t I n s u r a n c e Abstract This paper argues that d e p o s i t - i n s u r a n c e guarantee i s information about the value of a v a i l a b l e f r o m market- generated d a t a . the Under c e r t a i n assumptions, an unbiased e s t i m a t e o f t h e market v a l u e o f t h e d e p o s i t I n p r a c t i c e , however, i t i s o n l y p o s s i b l e t o guarantee i s r e a d i l y a v a i l a b l e . observe a lower bound a g a i n s t which e s t i m a t e s o f deposi t - i n s u r a n c e premia can be compared. In the associated absence with deposit- insurance of federal deposit insurance reforms, the includes: 1) total the guarantee guarantee on i n s u r e d d e p o s i t s , 2 ) a c o n d i t i o n a l guarantee on u n i n s u r e d d e p o s i t s , conditional guarantee of the stockholders' residual c l a i m on and 3) a the future e a r n i n g s o f t h e bank. Introduction The debate on pricing deposit insurance concern t o a p u b l i c p o l i c y concern. (19831, the Federal Home has gone f r o m a p u r e l y academic The Federal D e p o s i t I n s u r a n c e C o r p o r a t i o n Loan Bank Board (1983>, and t h e U.S. Treasury Department (The Working Group o f t h e Cabinet C o u n c i l on Economic A f f a i r s 1985) have a l l i s s u e d r e p o r t s on r i s k - b a s e d d e p o s i t - i n s u r a n c e p r i c i n g . These execu- http://clevelandfed.org/research/workpaper Best available copy tive- agency studies accompany deposit- insurance p r i c i n g (see, a large body of academic research on f o r example, A v e r y , Kawst, and Hanweck 119851; H o r v i t z [19831; Kane [1983, 1985, and 19861; Merton [1977, 19781; P y l e 11983, 19861; R o c h e s t e r and Walker [19851; and Ronn and Verma C19851). If the Federal Deposit d e p o s i t - i n s u r a n c e premium e q u a l Insurance Corporation charges a t o t h e r i s k premium t h e m a r k e t would r e q u i r e t o p r o v i d e t h e same l e v e l o f r i s k - b e a r i n g s e r v i c e s , appropriately priced.' (FDIC) The p u r p o s e o f t h i s paper u n c o n d i t i o n a l l y uninsured depositors e x i s t , then the is the market's insurance t o show ( 1 ) ex is that if ante estimate o f t h e f a i r v a l u e o f d e p o s i t i n s u r a n c e can be observed; and ( 2 ) i n t h e absence o f deposit- insurance reforms, t h e d e p o s i t insurance guarantee c o n s i s t s o f the d e p o s i t i n s u r a n c e p u t on t h e i n s u r e d d e p o s i t s , a c o n d i t i o n a l g u a r a n t e e o n t h e u n i n s u r e d d e p o s i t s , and a c o n d i t i o n a l g u a r a n t e e of t h e s t o c k h o l d e r s ' r e s i d u a l c l a i m o n t h e f u t u r e e a r n i n g s o f t h e bank. Section I o f t h i s paper, which o u t l i n e s the assumptions used a n a l y s i s , shows t h a t i f banks a r e c l o s e d when t h e y a r e f o u n d t o be in the insolvent, and u n i n s u r e d d e p o s i t o r s and s t o c k h o l d e r s b e a r t h e i r f u l l s h a r e o f t h e l o s s e s , t h e n t h e f a i r v a l u e o f t h e d e p o s i t g u a r a n t e e on $1 o f i n s u r e d d e p o s i t s i s t h e r i s k premium p a i d on $1 of uninsured deposits. Section I1 relaxes the a s s u m p t i o n t h a t t h e FDIC a l w a y s c l o s e s banks t h a t a r e f o u n d t o be i n s o l v e n t a t t h e time o f examination. ' W i t h FDIC f o r b e a r a n c e s , t h e o b s e r v e d r i s k p r e m i um o n $1 o f u n i n s u r e d d e p o s i t s i s a l o w e r bound e s t i m a t e o f t h e f a i r v a l u e o f t h e http://clevelandfed.org/research/workpaper Best available copy d e p o s i t guarantee on $1 o f insured deposits. Section I11 presents a numerical example showing how market i n f o r m a t i o n could be used i n c a l c u l a t i n g t h e f a i r value o f the d e p o s i t guarantee. The paper's conclusions a r e presented i n section IV. I. The Market Value o f Deposit Guarantees w i t h o u t FDIC Forbearances The f o l l o w i n g assumptions are used i n t h i s a n a l y s i s : Market 1) efficiency. This assumption is necessary the if market p a r t i c i p a n t s are t o p r o v i d e an accurate estimate o f the r i s k o f the The semi- strong form o f t h e e f f i c i ent- markets hypothesi s and bank. dissemination . 2> of adverse information regarding insured banks is r e q u i r e d f o r the a n a l y s i s t o hold. The absence o f e x t e r n a l s o c i a l benef i t s associated w i t h t h e p r o v i s i o n o f f e d e r a l d e p o s i t insurance a t the margin. I f the s o c i a l b e n e f i t s associated w i t h the l a s t d o l l a r o f deposit- insurance coverage exceed the private benefits deposit- insurance associated coverage, then the with the market last premium dollar is of not the s o c i a l l y optimal deposi t- insurance premi um (see M e r r i ck and Saunders [19851>. 3> A1 1 bank 1 i a b i 1it i e s are homogeneous d e p o s i t 1 i a b i 1i t i e s . The bank i s assumed t o issue one type o f deposit t h a t matures on the same day t h e bank is examined and the assumed f o r e x p o s i t i o n a l analysis to liabilities hold that n e g o t i a b l e CDs). is simplicity. that mature d e p o s i t guarantee i s r e p r i c e d . on the the bank All This that i s required for issue examination some date is the uninsured. d e p o s i t (possibly large http://clevelandfed.org/research/workpaper Best available copy Frictionless 4) . markets. The absence of transaction costs and indivisibilities in the deposit and insurance markets ensures that arbitrage can remove pricing errors when they occur. transaction costs and the indivisibilities The size of the limits the degree of pricing error that cannot be removed by arbitrage. No FDIC forbearances. 51 The F.DIC closes all banks that are insolvent. Stockholders of banks with a positive net worth that falls below the statutory (or regulatory) minimum capital requirements are given the option of increasing the capital in the bank or a1 lowing the deposit guarantor to close the bank. Banks with positive net worth that exceeds the statutory (or regulatory) minimum capital requirements are allowed to pay out the excess net worth to their stockholders. This is a counterfactual assumption. It assumes that the FDIC is capable of and wi 1 1 ing to close banks when they are found to be insolvent. Negative net worth is a necessary, but not a sufficient, condition for the forced closing of a bank by the FDIC.' The following notation is used throughout the paper: A = value of the bank's assets, B, = value of a $1 risk-free discount bond at time t, Dt = value of the bank's deposits at time t, C(*> = American call option, c(*) = European call option, D = the face value of D, at t=T, p(*) = European put option. http://clevelandfed.org/research/workpaper Best available copy When 100 p e r c e n t of a bank's deposits deposi t - i n s u r a n c e guarantee equal s t h e t o t a l provided in t h e v a l u e of the v a l u e o f r i sk-bear! ng s e r v i c e s t h e market by u n i n s u r e d d e p o s i t o r s when t h e bank i s s u e s o n l y uninsured d e p o s i t s . value o f are insured, Merton (1977) shows t h a t w i t h 100 p e r c e n t i n s u r a n c e t h e t h e d e p o s i t guarantee equals which a l l o w s the stockholders t o sell t h e European p u t o p t i o n p(A,T-t;D1, the assets o f t h e bank, d e p o s i t o r s f o r t h e f a c e v a l u e o f t h e i r d e p o s i t s , D, a t t i m e t=T. Merton (19741, i n t h e absence o f t h e d e p o s i t guarantee, to A, the Following the t o t a l value o f r i s k - b e a r i n g s e r v i c e s p r o v i d e d by t h e u n i n s u r e d d e p o s i t o r s i s , By M e r t o n ' s value of (1973) the Theorem 6, deposit and by l e t t i n g Do/D = d o and AID guarantee (risk- bearing services) on $1 a, = the o f - insured (uninsured) deposits a t t=O i s : The r e s u l t i n e q u a t i o n ( 2 ) has l i t t l e p r a c t i c a l use i n p r i c i n g d e p o s i t guarantees i f i t o n l y h o l d s when a1 1 o f t h e b a n k ' s d e p o s i t s a r e e i t h e r i n s u r e d or If uninsured. Bo-do cannot be 100 percent observed. If of the g u a r a n t o r have t h e same p r i o r i t y of the banks uninsured deposits are depositors and insured, the then deposit c l a i m a g a i n s t t h e assets o f t h e bank, r e l a x i n g t h e assumption o f f u l l o r no insurance t o a l l o w f o r p a r t i a l i n s u r a n c e o f t h e b a n k ' s d e p o s i t s does n o t a f f e c t e q u a t i o n ( 2 ) . 4 To see t h i s , l e t w, http://clevelandfed.org/research/workpaper Best available copy be The the percentage stockholders of now the hold p(w,,A,T-t;w,,D> FDIC and bank's two deposits that put options: issued by the are uninsured p(w,A,T-t;w,D> uninsured (~,+w,~=l). i s s u e d by t h e depositors. By M e r t o n ' s (1973) Theorem 6 , t h e t o t a l v a l u e o f t h e s t o c k h o l d e r s ' p u t o p t i o n s a t t = O i s : (3) p(w,A,T;w,,D) By d e f i n i t i o n , risk- bearing dollar w,+w,, = services of uninsured uninsured) deposits. + p(w,A,T;w,D> 1. T h e r e f o r e , a bank does n o t a f f e c t t h e v a l u e o f provided by t h e u n i n s u r e d d e p o s i t o r s (insured) The (w,+w,)p(A,T;D). = deposits by issuing value of the total (FDIC) w,D on each insured deposit guarantee (w,,D is w,D(Bo-do). 111. The A n a l y s i s w i t h Federal B a i l o u t s of I n s o l v e n t Banks T h i s s e c t i o n r e l a x e s assumption 5 o f s e c t i o n I by assuming t h a t a s e t o f constraints, banks. z, exists that affects t h e FDIC's a b i l i t y t o c l o s e i n s o l v e n t - The a n a l y s i s shows t h a t w i t h FDIC forbearances, t h e r i s k premium p a i d on t h e e x p l i c i t l y u n i n s u r e d d e p o s i t s i s t h e lower bound o f t h e m a r k e t ' s v a l u a t i o n o f t h e d e p o s i t guarantee. Furthermore, t h e c o s t o f t h e guarantee i s shown t o i n c r e a s e when t h e s t o c k h o l d e r s ' p o s i t i o n i n t h e bank i s n o t c l o s e d o u t when t h e bank i s found t o be i n s o l v e n t . L e t q ( z ) be t h e p r o b a b i l i t y t h a t a t t h e n e x t examination d a t e t h e bank i s i n s o l v e n t and t h e FDIC i s unable t o c l o s e i t . assumed to be a single index function, F o l l o w i n g Kane (1986>, z i s which consist of information http://clevelandfed.org/research/workpaper Best available copy constraints, staff constraints, the reserve position of the insurance fund, and political and legal constraints on the FDIC's ability to close insolvent banks. If the insolvent bank is allowed to operate, the FDIC may choose to operate it as a mutual institution (that is, close out the position of the existing shareholders) or a1 low the equity holders to retain their position. Initially, it is assumed that the equity holders are closed out. If a bank is found to be ins~lvent, both the FDIC and the uninsured depositors have the right to force the closing of the bank. If the FDIC wishes to a1 low the bank to operate until the next examination day, it must buy out the position of the uninsured depositors or guarantee value of the uninsured depositors' claim against the bank. The FDIC must provide a guarantee of at least the market value of the uninsured depositors' claim on the bank at the time of examination to keep the uninsured depositors from forcing a liquidation of the bank.6 It is assumed that the same set o f constraints, z, that prevents the FDIC from closing the bank, forces it to guarantee the face val ue of the uni nsured depos i ts. ' The value of the guarantee on $1 of conditionally uninsured deposits at t=O is q(z)p(a,T;l>. The risk-bearing services provided by the conditionally uninsured depositors on $1 of deposits at t=O is: The observed risk premium on $1 of conditional ly uninsured deposits is shown below in equation ( 5 ) : http://clevelandfed.org/research/workpaper Best available copy The f a i r v a l u e o f t h e d e p o s i t guarantee on $1 o f i n s u r e d d e p o s i t s i s now t h e observed r i s k premium on t h e c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s scaled by 1, minus t h e p r o b a b i l i t y t h a t t h e FDIC w i l l p r o t e c t t h e c o n d i t i o n a l l y u n i n s u r e d d e p o s i t o r i f t h e bank i s found t o be i n s o l v e n t . The t o t a l value o f the d e p o s i t - i n s u r a n c e s u b s i d i e s and guarantees i s : G = w i D ( B ~ - d o ) + q(z>~,D(Bo-do). (6) Because q ( z ) i s n o t observed, t h e m a r k e t ' s e s t i m a t e o f t h e f a i r v a l u e of t h e d e p o s i t guarantee cannot be observed. equal t o 1, However, s i n c e q ( z ) i s l e s s t h a n o r t h e r i s k premium p a i d on t h e c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s r e p r e s e n t s t h e minimum v a l u e o f t h e d e p o s i t - i n s u r a n c e guarantee. It i s a lower bound t h a t can be used t o e v a l u a t e e m p i r i c a l e s t i m a t e s o f t h e f a i r v a l u e of t h e d e p o s i t guarantee. The upper bound o f t h e f a i r v a l u e o f t h e d e p o s i t guarantee would be r e f l e c t e d i n t h e r i s k premium o f the subordinated debt i s s u e d b y t h e bank. E q u a t i o n (6) assumes t h a t t h e s t o c k h o l d e r s ' t h e bank i s found t o be i n s o l v e n t . p o s i t i o n i s c l o s e d o u t when L e t y ( z ) be t h e p r o b a b i l i t y t h a t on t h e n e x t examination day t h e bank i s i n s o l v e n t , and t h e s t o c k h o l d e r s r e t a i n t h e i r position in position i n i n s o l v e n t banks, option, C,, the bank. By which r e p r e s e n t s Max[y(z)C,,A-Dl. failing t o always c l o s e o u t t h e t h e FDIC has changed t h e the equity o f stockholders' value o f the call t h e bank and i s now equal The v a l u e o f t h e c a l l o p t i o n C,, to can be broken down i n t o two components: t h e value o f t h e e q u i t y w i t h o u t the deposit- insurance subsidy C, and t h e d e p o s i t - i n s u r a n c e s u b s i d y x = Max(0,A-D> = Max[y(z)C,,OI. t o t a l v a l u e o f t h e d e p o s i t - i n s u r a n c e s u b s i d i e s and guarantees a t t=O i s now: The http://clevelandfed.org/research/workpaper Best available copy Therefore, a l l o w i n g the stockholders t o r e t a i n th.eir r e s i d u a l c l a i m on t h e a s s e t s and f u t u r e e a r n i n g s o f t h e bank i n c r e a s e s t h e v a l u e of the deposit guarantee. 111. Market Estimates of t h e D e p o s i t Guarantee To demonstrate how market i n f o r m a t i o n can be used i n p r i c i n g t h e d e p o s i t guarantee, t h e y i e l d s on six- month (secondary market) certificates collected.' of deposit (CDs), and prime Treasury b i l l s , commercial paper (CP) bank are The y i e l d s a r e t h e d a i l y quoted ones r e p o r t e d i n t h e Federal Reserve B o a r d ' s s t a t i s t i c a l r e l e a s e H.15, " Selected I n t e r e s t Rates," f o r the t r a d i n g day c l o s e s t t o January 1 and J u l y 1 f o r each year 1980 t h r o u g h 1985. A l l r e p o r t e d y i e l d s a r e c o n v e r t e d t o bond- equivalent ones. An annual y i e l d i s computed f o r each i n s t r u m e n t by t a k i n g t h e geometric average o f i t s six- month y i e l d i n January and J u l y f o r t h a t year. The r i s k premium on CDs (CP) i s c a l c u l a t e d as t h e d i f f e r e n c e between t h e annual y i e l d on CDs ' ( c P ) and T - b i l l s . Assuming 10 p e r c e n t i n s u r a n c e and ' O d i f f e r e n t v a l u e s o f q ( z > , t h e v a l u e of t h e d e p o s i t guarantee i s e s t i m a t e d f r o m t h e r i s k premium on t h e CDs. on $1 of " insured deposits i s R By e q u a t i o n ( 5 ) , - q . t h e v a l u e o f t h e guarantee The v a l u e o f t h e guarantee on $1 o f c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s i s q(z)R,,/(1-q(z)). T a b l e 1 p r e s e n t s numerical e s t i m a t e s of t h e v a l u e o f t h e d e p o s i t guarantee on $1 o f i n s u r e d and c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s f o r 1980 t o 1985. p o i n t s are brought out i n the table. Two F i r s t , t h e v a l u e o f t h e guarantee on t h e http://clevelandfed.org/research/workpaper Best available copy c o n d i t i o n a l l y uninsured deposits i s a p o s i t i v e f u n c t i o n o f q(z). Second, the v a l u e o f t h e d e p o s i t guarantee on i n s u r e d and c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s v a r i e s across y e a r s . the conditionally If q ( z > i s n o t known, t h e n t h e observed r i s k premium on uninsured d e p o s i t s can o n l y be used as the lower a g a i n s t which e s t i m a t e s o f t h e d e p o s i t guarantee can be compared. bound As seen i n t a b l e 1, t h e degree t o which t h e observed l o w e r bound can be used t o f i n e - t u n e r i s k - b a s e d models o f d e p o s i t guarantees decreases as q ( z > i n c r e a s e s . One way o f making q ( z ) o b s e r v a b l e i s t o f o r c e banks t o i s s u e d i s c o u n t bonds that can be insulated would have the same m a t u r i t y from as the the deposit deposit p r i o r i t y o f c l a i m on t h e bank as d e p o s i t s . debt is deposits Rb = Bo-do. The value (BO-do) i s now o b s e r v a b l e . of In guarantees. insurance These " bonds p u t and t h e same The r i s k premium on $1 o f t h i s the deposit addition, t h e guarantee on c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s guarantee q ( z > and on the (q(z)(Bo-do)> insured value of can now be computed as: IV. Conclusion The market p r o v i d e s i n f o r m a t i o n on t h e v a l u e o f d e p o s i t guarantees. Under r e s t r i c t i v e assumptions, t h e v a l u e o f t h e d e p o s i t guarantee i s o b s e r v a b l e . p r a c t i c e , however, o n l y a lower bound can be observed. system o f f e d e r a l d e p o s i t insurance, Under In the current t h e d e p o s i t guarantee c o n s i s t s o f ( 1 ) t h e http://clevelandfed.org/research/workpaper Best available copy guarantee of the insured deposits, ( 2 ) a conditional guarantee of the bank's uninsured deposits, and (3) a guarantee of the stockholders' residual o n the future earnings of the bank. Because the guarantee has real value t o the banks' stockholders, insolvent banks should always be reorganized in a manner that closes o u t the position of the stockholders. http://clevelandfed.org/research/workpaper Best available copy Notes 1. For purposes o f e x p o s i t i o n , t h i s paper c o n c e n t r a t e s on t h e v a l u e o f FDIC guarantees. The a n a l y s i s i s v a l i d f o r a l l t h r e e f e d e r a l d e p o s i t g u a r a n t o r s : t h e FDIC, t h e Federal Savings and Loan I n s u r a n c e C o r p o r a t i o n (FSLIC), and t h e N a t i o n a l C r e d i t Union Share I n s u r a n c e Fund (NCUSIF). 2. L e g a l l y , t h e FDIC does n o t have t h e power t o c l o s e i n s o l v e n t banks. The FDIC must p e t i t i o n t h e b a n k ' s c h a r t e r i n g agency t o c l o s e t h e bank. However, t h i s process i s g e n e r a l l y a f o r m a l i t y , and, i n p r a c t i c e , t h e FDIC i s a b l e t o f o r c e t h e c l o s i n g o f i n s o l v e n t banks. 3. See Kane (1986) f o r a d i s c u s s i o n o f t h e c o n s t r a i n t s f a c e d by t h e FDIC t h a t may p r e v e n t i t f r o m c l o s i n g i n s o l v e n t banks. 4. C u r r e n t l y , t h e d e p o s i t guarantee i s e x p l i c i t l y extended t o t h e f i r s t $100,000 o f each d e p o s i t account ( t h i s 1i m i t i s p e r person, p e r account t y p e , a t each i n s u r e d i n s t i t u t i o n ) . I f t h e d e p o s i t guarantee i s n o t extended t o t h e e x p l i c i t l y u n i n s u r e d d e p o s i t s , t h e s t a t u t o r y guarantee o f o n l y t h e f i r s t $100,000 o f any d e p o s i t does n o t a f f e c t t h e v a l u a t i o n o f t h e p o r t i o n o f t h e A proof o f t h i s i s available from the author. d e p o s i t i n excess o f $100,000. 5. T h i s i s assumed f o r e x p o s i t i o n a l s i m p l i c i t y . The a n a l y s i s i s s t i l l v a l i d i n cases where t h e purchase- and- assumption method i s used t o d i s p o s e o f t h e bank (and any o t h e r t e c h n i q u e used t o h a n d l e a f a i 1i n g bank t h a t l e a v e s u n i n s u r e d d e p o s i t o r s whole). 6. I t does n o t m a t t e r whether t h e FDIC buys o u t t h e u n i n s u r e d d e p o s i t o r s and i s s u e s i n s u r e d d e p o s i t s t o r e p l a c e them, o r guarantees t h e market v a l u e o f t h e uninsured deposits. 7. T h i s assumption seems t o h o l d i n p r a c t i c e . H i s t o r i c a l l y , t h e m a j o r i t y o f f a i l e d banks have been disposed o f u s i n g t h e purchase- and- assumption t e c h n i q u e (see B a r n e t t , H o r v i t z , and S i l v e r b e r g [19771>. 8. I f t h e bank i s n o t r e q u i r e d t o pay f o r t h e c o n d i t i o n a l guarantee on i t s u n i n s u r e d d e p o s i t s , i t r e c e i v e s a subsidy from t h e FDIC o f q ( z ) ( B o - d o > on each d o l l a r o f c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s i t i s s u e s . C o m p e t i t i o n among banks f o r c o n d i t i o n a l l y u n i n s u r e d d e p o s i t s m i g h t r e s u l t i n a f r a c t i o n , v,, o f t h e subsidy b e i n g p a i d t o t h e c o n d i t i o n a l l y u n i n s u r e d d e p o s i t o r s . The observed r i s k premium on $1 o f c o n d i t i o n a l l y uninsured d e p o s i t s i s R, = (l-q(z>(l-~~))(Bo-do>. 9. For e x p o s i t i o n a l purposes, i t is,assumed t h a t x=O. 10. The spread between t h e T - b i l l r a t e and t h e CD and CP r a t e s i n c l u d e s a t a x d i f f e r e n t i a l because T - b i l l s a r e n o t s u b j e c t t o s t a t e and l o c a l taxes, w h i l e CDs and CP are. This makes t h e spreads w i d e r than t h e t r u e r i s k - i n d u c e d spread and biases t h e d e p o s i t guarantee e s t i m a t e s upward. http://clevelandfed.org/research/workpaper Best available copy 11. 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