Non-parametric demand analysis is used in order to establish admissibl
e monetary aggregates and also to establish a potential role for relat
ive prices in the money demand function. A conventional money demand s
pecification is then contrasted with a money demand function which con
tains the relative prices of durables, non-durables and services as ad
ditional regressors. Evidence from long run cointegration analysis, sh
ort run error correction models and non-nested testing all confirm a r
ole for relative prices in the UK personal sector's money demand funct
ion.