【单选题】A firm faces a downward sloping demand curve, QD = 500 - 20P. The marginal revenue if the price were decreased from $18.00 to $17.95 is closest to:
【单选题】Clara's utility function is U (X; Y )=(X + 2)(Y + 1). If her marginal rate of substitution is - 2 and she is consuming 9 units of Good X; how many units of Good Y must she be consuming? and x2 = p1=p2...