The attempt to draw a hard and fast line of distinction where there is no real discontinuity in nature has often done more mischief, but has perhaps never led to more quaint results, than in the rigid definitions which have been sometimes given of this term Productive. Some of them for instance lead to the conclusion that a singer in an opera is unproductive, that the printer of the tickets of admission to the opera is productive; while the usher who shows people to their places is unproductive, unless he happens to sell programmes, and then he is productive. Senior points out that "a cook is not said to make roast meat but to dress it; but he is said to make a pudding.... A tailor is said to make cloth into a coat, a dyer is not said to make undyed cloth into dyed cloth. The change produced by the dyer is perhaps greater than that produced by the tailor, but the cloth in passing through the tailor's hands changes its name; in passing through the dyer's it does not: the dyer has not produced a new name, nor consequently a new thing." Pol. Econ. pp. 51, 2.