The Wealth of Nations by Part 1 Chapter 10 Page 59

Scotland, and many other parts of Europe, it frequently means no more than a single story. A tradesman in London is obliged to hire a whole house in that part of the town where his customers live. His shop is upon the ground-floor, and he and his family sleep in the garret; and he endeavours to pay a part of his house-rent by letting the two middle stories to lodgers. He expects to maintain his family by his trade, and not by his lodgers. Whereas, at Paris and Edinburgh, the people who let lodgings have commonly no other means of subsistence and the price of the lodging must pay, not only the rent of the house, but the whole expense of the family.

Part 2: Inequalities by the Policy of Europe

Such are the inequalities in the whole of advantages and disadvantages of the different