________ is the market structure in which there are many rival firms producing differentiated products

If the money supply in an economy is $100,000, currency in circulation is $50,000, amount in savings accounts is $18,000, travelers' checks is $12,000, and the amount in money market accounts is $9,000,

then what is the amount held in checking accounts in the economy?

If firms' inventories exceed their planned inventories, firms

A) increase employment. B) increase GDP. C) increase production. D) increase income. E) decrease production.