Mencius - Book 3, Part 1, Chapter 4B

Mencius said,'I suppose that Hsü Hsing sows grain and eats the produce. Is it not so?' 'It is so,' was the answer. 'I suppose also he weaves cloth, and wears his own manufacture. Is it not so?' 'No. Hsü wears clothes of haircloth.' 'Does he wear a cap?' 'He wears a cap.' 'What kind of cap?' 'A plain cap.' 'Is it woven by himself?' 'No. He gets it in exchange for grain.' 'Why does Hsü not weave it himself?' 'That would injure his husbandry.' 'Does Hsü cook his food in boilers and earthenware pans, and does he plow with an iron share?' 'Yes.' 'Does he make those articles himself?' 'No. He gets them in exchange for grain.'

Mencius then said, 'The getting those various articles in exchange for grain, is not oppressive to the potter and the founder, and the potter and the founder in their turn, in exchanging their various articles for grain, are not oppressive to the husbandman. How should such a thing be supposed? And moreover, why does not Hsü act the potter and founder, supplying himself with the articles which he uses solely from his own establishment? Why does he go confusedly dealing and exchanging with the handi-craftsmen? Why does he not spare himself so much trouble?' Ch'an Hsiang replied, 'The business of the handi-craftsman can by no means be carried on along with the business of husbandry.'
~ James Legge translation via nothingistic.org ~

Go here to read the introductory post to this serialized version of the Works of Mencius.