"In the economic sphere, an act, a habit, an institution, a law produces not only one effect, but a series of effects. Of these effects, the first alone is immediate; it appears simultaneously with its cause; it is seen. The other effects unfold only subsequently; they are not seen. Between a bad and a good economist, this is the whole difference: one confines himself to the visible effect; the other takes into account both the effect that can be seen and those effects that must be foreseen."