Front Page Titles (by Subject) Dimensions of Labour. - The Theory of Political Economy
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Dimensions of Labour. - William Stanley Jevons, The Theory of Political Economy 
The Theory of Political Economy (London: Macmillan, 1888) 3rd ed.
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Dimensions of Labour.
If I have correctly laid down, in preceding chapters, the Theory of Dimensions of Utility and Value, there ought not to be much difficulty in stating the similar theory as regards Labour. We might in fact treat labour as simply one case of disutility or negative utility, that is as pain, or at any rate as a generally painful balance of pleasure and pain, endured in the action of acquiring commodity. Thus its dimensions might be described as identical with those of utility; U would then denote intensity of labour, or degree of labour, just as it was used to denote degree of utility. If we measure labour with respect to the quantity of commodity produced, that is, if we make commodity the variable, then total amount of labour will be the integral of U dM, and the dimensions of amount of labour will be MU, identical with those of total utility.
If for any reasons of convenience we prefer to substitute a new symbol, specially appropriated to express the dimensions of labour, and say that intensity of labour is represented by E (Endurance), and total quantity of labour incurred in the production of certain commodity by ME, it must be remembered that the change is one of convenience only; U and E are essentially quantities of the same nature, and the difference, so far as there is any, arises from the fact that quantities symbolised by E will usually be negative as compared with those symbolised by U. Labour, however, is often measured and bought and sold by time, instead of by piecework or commodity produced; in this case, while E continues to express intensity of labour, ET will express the dimensions of amount of labour.
Rate of production will obviously possess the same dimensions as rate of consumption (p. 64), namely, MT-1, and this quantity forms a link between labour as measured by time and by produce; for ET × MT-1 = ME. It would be possible to invent various other economic quantities, such as acceleration of production, with the dimensions MT-2; but, until it is apparent how such quantities enter into economic theorems, it seems needless to consider them further.