On April 30, one year before maturity, Nissim Company retired $100,000 of its 9% bonds payable at the current market price of 101 (101% of the bond face amount, or $100,000 3 1.015 $101,000). The bond book value on April 30 is $98,300, reflecting an unamortized discount of $1,700. Bond interest is currently fully paid and recorded up to the date of retirement. What is the gain or loss on retirement of these bonds? Is this gain or loss a real economic gain or loss? Explain.