We break the aggregate working day into three segments: (1) the number of hours that households devote to production on their own account; (2) the number of hours in which they work for wages while producing those goods and services they will purchase as commodities; and (3) the number of hours that they work for wages while producing those goods and services that will be bought by other classes. For convenience, assume that the second stretch of time is devoted to the production of necessities and the third to luxuries and goods for capital accumulation. This third segment would measure
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