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Disagreeableness and disgrace affect the profits of stock in the

same manner as the wages of labour. The keeper of an inn or

tavern, who is never master of his own house, and who is exposed

to the brutality of every drunkard, exercises neither a very

agreeable nor a very creditable business. But there is scarce any

common trade in which a small stock yields so great a profit.

Secondly, the wages of labour vary with the easiness and

cheapness, or the difficulty and expense, of learning the

business.