there was little agreement about that, because rival economists each had their own theory about the real sources of wealth-creation--even if they might agree that the value of production must equal the sum of the new revenue which it generates for the producers.

Political economy was originally considered to be a "moral science", which arose out of the moral and juridical ambiguities of trading processes themselves. It was analytically difficult to take the step from the incomes of individuals, the immediate source of which was rather