They will also take care that the sales which the citizens are required to make to strangers are duly executed.
The law shall be, that on the first day of each month the auctioneers to whom the sale is entrusted shall offer grain; and at this sale a twelfth part of the whole shall be exposed, and the foreigner shall supply his wants for a month.

On the tenth, there shall be a sale of liquids, and on the twenty-third of animals, skins, woven or woollen stuffs, and other things which husbandmen have to sell and foreigners want to buy.
None of these commodities, any more than barley or flour, or any other food, may be retailed by a citizen to a citizen; but foreigners may sell them to one another in the foreigners' market.

There must also be butchers who will sell parts of animals to foreigners and craftsmen, and their servants; and foreigners may buy firewood wholesale of the commissioners of woods, and may sell retail to foreigners.

All other goods must be sold in the market, at some place indicated by the magistrates, and shall be paid for on the spot.

He who gives credit, and is cheated, will have no redress.