Econometrica: Apr 1969, Volume 37, Issue 2

A Nonlinear, Maximum Likelihood Estimate of the Liquidity Trap<324:ANMLEO>2.0.CO;2-G
p. 324-332

Howard W. Pifer

Recent articles in Econometrica have questioned whether the empirical evidence from time series data supports the Keynesian hypothesis of the existence of a liquidity trap for low interest rates. This paper proposes a method by which one can obtain the maximum likelihood estimate of the minimum interest rate without imposing a priori constraints upon the parameters in the demand for money equation. Alternative estimating procedures are considered and found to yield consistent estimates of the interest rate floor.

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