Now in an economy in equilibrium, a given industry can expand only at the expense of other industries. For at any moment the factors of production are limited. One industry can be expanded only by diverting to it labor, land and capital that would otherwise be employed in other industries. And when a given industry shrinks, or stops expanding its output, it does not necessarily mean that there has been any net decline in aggregate production. The shrinkage at that point may have merely released labor and capital to permit the expansion of other industries. It is erroneous to conclude, therefore, that a shrinkage of production in one line necessarily means a shrinkage in total production.
Another fundamental economic truth from Hazlitt's Economics in One Lesson.