thus assured, its processes, which consist simply in identification and separation, have the same certainty.
In this sense it is as exact a science as geometry, which, from similar truths relative to space, obtains its conclusions by similar means, and its conclusions when valid should be as self-apparent. And although in the domain of political economy we cannot test our theories by artificially produced combinations or conditions, as may be done in some of the other sciences, yet* we can apply tests no less conclusive, by comparing societies in which different conditions exist, or by, in imagination, separating, combining, adding or eliminating forces or factors of known direction.
I propose in the following pages to attempt to solve by the methods of political economy the great problem I have outlined. I propose to seek the law which associates poverty with progress, and increases want with advancing wealth; and I believe that in the explanation of this paradox we shall find the explanation of those recurring seasons of industrial and commercial paralysis which, viewed independently of their relations to more general phenomena, seem so inexplicable. Properly commenced and carefully pursued, such an investigation must yield a conclusion that will stand every test, and as truth, will correlate with all other truth. For in the sequence of phenomena there is no accident. Every effect has a cause, and every fact implies a preceding fact.
That political economy, as at present taught, does not explain the persistence of poverty amid advancing wealth in a manner which accords with the deep-seated perceptions of men; that the unquestionable truths which it does teach are unrelated and disjointed; that it has failed to make the progress in popular thought that truth, even when unpleasant, must make; that, on the contrary, after a century of cultivation, during which it has
