Which of the following is an example of a price floor?

Minimum wage laws
Rent controls
The price controls used in the United States during World War II
Usury laws


After World War II the United States got rid of the ration coupons that they had used during the war. The reason the country could get rid of these coupons was that:

it got rid of most price ceilings.
without war production, there was no scarcity.
it substituted queuing.
people's incomes rose so much after the war they no longer needed coupons.

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