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The profits of stock seem to be very little affected by the

easiness or difficulty of learning the trade in which it is

employed. All the different ways in which stock is commonly

employed in great towns seem, in reality, to be almost equally

easy and equally difficult to learn. One branch, either of

foreign or domestic trade, cannot well be a much more intricate

business than another.

Thirdly, the wages of labour in different occupations vary with

the constancy or inconstancy of employment.