In the consumer price index of the United States

. In the consumer price index of the United States:

1. the current cost of a basket of goods is compared to the base-period cost of the same basket of goods.
2. calculation of the base-period index is always equal to 100.
3. the base period is 1982–1984.
4. the current cost of a basket of goods is compared to the base-period cost of the same basket of goods, the calculation of the base-period index is always equal to 100, and the base period is 1982-1984.