duals. The gains of Italian opera singers, German governesses, French ballet dancers, &c., are a source of wealth, as far as they go, to their respective countries, if they return thither. The petty states of Greece, especially the ruder and more backward of those states, were nurseries of soldiers, who hired themselves to the princes and satraps of the East to carry on useless and destructive wars, and returned with their savings to pass their declining years in their own country: these were unproductive labourers, and the pay they received, together with the plunder they took, was an outlay without return to the countries which furnished it; but, though no gain to the world, it was a gain to Greece. At a later period the same country and its colonies supplied the Roman empire with another class of adventurers, who, under the name of philosophers or of rhetoricians, taught to the youth of the higher classes what were esteemed the most valuable accomplishments: these were mainly unproductive labourers, but their ample recompense was a source of wealth to their own country. In none of these cases was there any accession of wealth to the world. The services of the labourers, if useful, were obtained at a sacrifice to the world of a portion of material wealth; if useless, all that these labourers consumed was to the world waste.
To be wasted, however, is a liability not confined to unproductive labour. Productive labour may equally be wasted, if more of it is expended than really conduces to production. If defect of skill in labourers, or of judgment in those who direct them, causes a misapplication of productive industry; if a farmer persists in ploughing with three horses and two men, when experience has shown that two horses and one man are sufficient, the surplus labour, though employed for purposes of production, is wasted. If a new process is adopted which proves no better, or not so good as those before in use, the labour expended in perfecting the invention and in carrying it into practice, though employed for a productive purpose, is wasted. Productive labour may render a nation
