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ABSTRACTThis paper examines the forward‐looking rational expectations buffer stock model of Cuthbertson and Taylor (1987) in the context of the personal sector of the UK. The buffer stock model is evaluated for both narrow and broad money definitions in the UK using the encompassing the VAR methodology of Mizon (1984). This suggests that the buffer stock model is a congruent model, and that the broad definition is the most appropriate aggregate with which to model buffering behaviour — in line with previous studies, Mizen (1992). Further analysis of the models, in the light of Hendry (1988), confirms this view.

This paper considers the functional relationship between relative price variability (RPV) and inflation using quarterly personal consumer expenditure data in the US over 1967(I)–2003(I), deriving some implications for monetary policy. Non‐parametric regression techniques are used to explore the shape of the RPV function, and this shape is related to the theory outlined by J. J. Rotemberg. The empirical RPV function yields a plausible 'optimal' value of inflation in the region of five percentage points, which is consistent with this theory and lies within the range of values cited by recent evaluations of 'sand' and 'grease' effects.