This paper examines banks' provision of liquidity to depositors and piovisi
on of loans. The problem identified is that banks may not be able to provid
e new funds for borrowers who are short of cash, because either the return
on investments is poor, or because depositors withdraw more funds than expe
cted. Banks subject to liquidity shortages may ration loans to good borrowe
rs. This problem is shown to depend upon the nature of the deposit contract
and banks' inability to issue subordinated deposits. State contingent rene
gotiation of loans and matching of the duration of project returns and inve
stment needs mitigates the problem.