Under liquidity preference theory, which of the following is always true a. Forward rates are higher than expected future spot rates. b. The spot rate for a certain maturity is higher than the par yield for that maturity. c. The forward rate is higher than the spot rate when both have the same maturity. d. Forward rates are unbiased predictors of expected future spot rates. A company enters into a long futures contract to buy 1,000 units of a commodity for $20 per unit. The initial margin is $6,000 and the maintenance margin is $4,000. What futures price will allow $2,000 to be withdrawn from the margin account? a. $21 b. $20 c. $24 d. $25 e. $22