onsumers have always borrowed money from friends, neighbors and relatives. Merchants would not exist without credit; the habit of making debts on a “slate” in the local butcher or greengrocer was still common in the middle of the twentieth century. But the local merchant would normally offer credit only to a known, local customer; serial defaulters, or those deemed to be untrustworthy, would be refused business. In David Copperfield, Mr. Micawber’s failure to repay merchants required him to cadge off his friends.

But the modern idea of widespread consumer credit (in the form of national lenders, credit cards, etc.) really dates to the Industrial Age.