The Wealth of Nations by Part 1 Chapter 10 Page 42

therefore, being the same in both places, they are cheapest where the least profit is charged upon them. The prime cost of bread and butcher’s meat is greater in the great town than in the country village; and though the profit is less, therefore, they are not always cheaper there, but often equally cheap.

In such articles as bread and butcher’s meat, the same cause, which diminishes apparent profit, increases prime cost. The extent of the market, by giving employment to greater stocks, diminishes apparent profit; but by requiring supplies from a greater distance, it increases prime cost. This diminution of the one and increase of the other seem, in most cases, nearly to counterbalance one another, which is probably the reason that, though the prices of corn and cattle are commonly very different in different