Definition: War bonds are debt securities issued by a government to finance military operations and other expenditure in times of war. The bonds also remove money from circulation and thus also help to control inflation.
Sentence: During World War II the government and even radio and movie stars worked hard to convince people to buy war bonds.
Definition: A process of economic expansion and contraction that occurs repeatedly. The boom and bust cycle is a key characteristic of today's capitalist economies. During the boom the economy grows, jobs are plentiful and the market brings high returns to investors.
Sentence: The boom-and-bust cycle is a big factor in today's economy.