THIS STUDY of the destabilizing role of private balance sheets compares the following time series (monthly in most cases) from I927 to I 947: ( i ) the volumes outstanding of demand deposits, currency outside the Treasury and the Federal Reserve Banks, time deposits, cashsurrender value of life insurance policies, postal savings, federal securities held by the non-financial public, farm debt, non-farm mortgage debt, long-term corporate debt to insurance companies and commercial banks, consumer debt, bank loans and discounts; (2) the ratio of a representative group of liquid assets to a representative collection of private debts; (3) the level of private expenditures; (4) income velocity of circulation; and (5) the volume of private investment. Observations include the following: (i) The turning points, and fluctuations in the rate of change, of the balance-sheet ratio usually preceded similar changes in the volume of private expenditures. (2) Turning points in both dollar and deflated volume of demand deposits consistently preceded both upturns and downturns in the level of private spending by two to fifteen months (except for the December, I945, downturn in the deflated value of demand deposits which had not been succeeded by a fall in the volume of expenditures). (3) Fluctuations often occurred first in bank investments, next in bank loans and discounts, and then in consumer and other debts. (4) Fluctuations in bank investments frequently led changes in the volume of private investment. (5) Fluctuations in the volume of short-term debts to the banks accompanied greater changes in the level of spending than did comparable fluctuations in the volume of bank investments. (6) The changing volume of claims not matched by private debts (e.g., government redeemables) appeared to have negligible effect on cash-balance requirements and velocity compared to the changing volume of claims possessing fair-weather liquidity matched by private debts with variable illiquidity. (7) Changing volume and illiquidity of short-term debts accompanied greater changes in the level of spending than did changing volume, real burden, or illiquidity of longterm debts. (8) Fluctuations in the volume and liquidity of near-
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