Abstract
This paper introduces the concepts of conditional demand functions, the length of run, and separability to consumer and family economists as useful tools for empirical research on household behaviour. The relationships among demand, expenditure, and consumption functions are sketched. Then conditional demand functions are explained, their uses in empirical work addressed, and several applications discussed. The concepts of the length of run and of separability are explained in terms of conditional demand and their implications for and applications to empirical research on household behaviour treated.

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