Nearly all variables and constants, whether they occur in physics, biology, sociology or economics, have units in which they are defined and measured. For example, in dealing with labour, economists sometimes talk of man-hours and in production they talk of output of cars per year. This chapter is concerned with the dimensions of variables and constants. Because this aspect of measurement is generally ignored by economists we have gone to some effort to explain the physical dimensions used by physicists so that we can appreciate the problem faced by social scientists in defining a basic set of dimensions.
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