The Wealth of Nations by Part 1 Chapter 10 Page 41

Where ten thousand pounds can be employed in the grocery trade, the wages of the grocer’s labour make but a very trifling addition to the real profits of so great a stock.

The apparent profits of the wealthy retailer, therefore, are there more nearly upon a level with those of the wholesale merchant. It is upon this account that goods sold by retail are generally as cheap and frequently much cheaper in the capital than in small towns and country villages. Grocery goods, for example, are generally much cheaper; bread and butcher’s meat frequently as cheap. It costs no more to bring grocery goods to the great town than to the country village; but it costs a great deal more to bring corn and cattle, as the greater part of them must be brought from a much greater distance. The prime cost of grocery goods,