*2.4 Between 1971 and 2006, the United States from time to time imposed quotas or other restrictions on importing steel. A quota says that no more than Q 7 0 units of steel can be imported into the country. Suppose both the domestic supply curve of steel,

Sd , and the foreign supply curve of steel for sale in the United States, Sf , are upward-sloping straight lines. How did a quota set by the United States on foreign steel imports of Q affect the total U.S.
supply curve for steel (domestic and foreign supply combined)?