In semiparametric models it is a common approach to under-smooth the nonparametric functions in order that estimators of the finite dimensional parameters can achieve root-n consistency. The requirement of under-smoothing may result as we show from inefficient estimation methods or technical...

Fifty years ago, Friedman and Schwartz presented evidence of pro-cyclical movements in the money stock, exhibiting a lead over corresponding movements in output, found in historical monetary statistics for the United States. Very similar relationships appear in more recent data. To see them...