An economic datum is not then a hedonistic datum, nor, in general, a mechanical datum. But as the fact of man's _activity_, it still remains to determine whether it is a fact of _knowledge_ or of _will_: whether it is theoretical or practical. You, who conceive it as choice, can have no doubt that it is a fact of practical activity, _i.e._ of _will_. This is also my own conclusion. _To choose_ something can only mean _to will it_. But you somewhat obscure the conclusion now indicated when you speak of _logical_ and _illogical_ actions, and place actions properly economic amongst the former. Logical and illogical bring us back to theoretical activity. A _logical_ or _illogical_ action is a common way of speaking; but it is not a way of speaking exactly or accurately. The logical work of thought is quite distinct from the action of the will. To reason is not to will. Nor is to will to reason; but the will _presupposes_ thought and hence logic. He who does not think, cannot even will. I mean by willing, what is known to us by the evidence of our consciousness; not Schopenhauer's metaphysical _will_. In _knowledge_, in so far as it is a necessary presupposition of economic action, is found, if not a justification, an explanation of your phrases about _logical and illogical actions_. Economic actions are always (we say so, at any rate) _logical_ actions, _i.e._ preceded by logical acts. But it is necessary to distinguish carefully the two stages: the phenomenon and its presupposition, since _from lack of distinction between the two stages has arisen the erroneous conception of the economic principle as a technological fact_. I have criticised at length in other essays this confusion between _technical_ and _economic_, and I may be allowed to refer both to what I have written in my review of Stammler's book _Wirthschaft und Recht_, and to the more exact analyses in my recent memorandum on the _Estetica_. Stammler maintains precisely that the economic principle can be nothing but a technical concept. I would advise anyone who wishes to see at a glance, the difference between the technical and the economic to consider carefully in what a _technical error_ and in what an _economic error_ respectively consist. A technical error is ignorance of the laws of the material on which we wish to work: for instance the belief that it is possible to put very heavy beams of iron on a delicate wall, without the latter falling into ruins. An _economic_ error is the not aiming directly at one's own object; to wish this and that, _i.e._ not really to wish either this or that. A technical error is an error of knowledge: an economic error is an error of will. He who makes a technical mistake will be called, if the mistake is a stupid one, an ignoramus; he who makes an economic mistake, is a man who does not know how to behave in life: a weak and inconclusive person. And, as is well known and proverbial, people can be _learned_