In this type of market, supply normally is very elastic. In the long run, as well as in the short, supply is responsive to demand in the market for manufactures. It is easier to change the composition of a firm’s output than it is to change the production of a mine or a plantation. And when changes in demand are not too rapid, gross profits from one plant can be siphoned off and invested in something quite different. When business is good, moreover, there is continual new investment so that productive capacity is adapted to meeting changing requirements. Workers themselves may not even be aware of changes in the final commodities to which their work contributes, and the level of wages for any grade of factory labor is very little affected by the fortunes of a particular market.