When trading corn, an initial maintenance requirement of $4,000 exists on a contract to 100,000 bushels of corn at $6.28 per bushel. There is a maintenance margin of $3,200. If the price of corn increases, how does the use of margin affect return? a. Return is amplified in a negative direction. b. Return is amplified in a positive direction. c. Return is dampened in a positive direction. d. Return is dampened in a negative direction