19. I shall adopt _two different lines of investigation_. First, I shall examine protectionism on its own claims and pretensions, taking its doctrines and claims for true, and following them out to see whether they will produce the promised results; and secondly, I shall attack protectionism adversely, and controversially. If any one proposes a device for the public good, he is entitled to candid and patient attention, but he is also under obligation to show how he expects his scheme to work, what forces it will bring into play, how it will use them, etc. The joint stock principle, credit institutions, coöperation, and all similar devices must be analyzed and the explanation of their advantage, if they offer any, must be sought in the principles which they embody, the forces they employ, the suitableness of their apparatus. We ought not to put faith in any device (_e.g._, bi-metalism, socialism) unless the proposers offer an explanation of it which will bear rigid and pitiless examination; for, if it is a sound device, such examination will only produce more and more thorough conviction of its merits. I shall therefore first take up protectionism just as it is offered, and test it, as any candid inquirer might do, to see whether, as it is presented by its advocates, it has any claims to confidence. CHAPTER II PROTECTIONISM EXAMINED ON ITS OWN GROUNDS 20. It is the peculiar irony in all empirical devices in social science that they not only fail of the effect expected of them, but that they produce the exact opposite. Paper money is expected to help the non-capitalist and the debtor and to make business brisk. It ruins the non-capitalists and the debtors, and reduces industry and commerce to a standstill. Socialistic devices are expected to bring about equality and universal happiness. They produce despotism, favoritism, inequality, and universal misery. The devices are, in their operation, true to themselves. They act just as an unprejudiced examination of them should have led any one to expect that they would act, or just as a limited experience has shown that they must act. If protectionism is only another case of the same kind, an examination of it on its own grounds must bring out the fact that it will issue in crippling industry, diminishing capital, and lowering the average of comfort. Let us see. (_A_) ASSUMPTIONS IN PROTECTIONISM.