The Wealth of Nations by Part 4 Chapter 5 Page 2

all our pockets by means of the balance of trade.

Bounties, it is allowed, ought to be given to those branches of trade only which cannot be carried on without them. But every branch of trade in which the merchant can sell his goods for a price which replaces to him, with the ordinary profits of stock, the whole capital employed in preparing and sending them to market, can be carried on without a bounty. Every such branch is evidently upon a level with all the other branches of trade which are carried on without bounties, and cannot therefore require one more than they. Those trades only require bounties in which the merchant is obliged to sell his goods for a price which does not replace to him his capital, together with the ordinary profit; or in which he is obliged to sell them for less than it really costs him to send them to market.