What kind of market runs most efficiently when one large firm supplies all of the output?

To be a successful entrepreneur requires willingness to

a. play it safe b. borrow money c. take risks d. abandon your family

A bond has a face value of $10,000, a price of $12,000, and coupon payments of $2000 for two years. The current yield of this bond is

A) 10%. B) 16.7%. C) 20%. D) 30%. E) none of the above