Suppose Carrie's utility function for clams is as follows: If she consumes 1 clam, she gets 10 units of total utility; for 2 clams, she gets 18 units of total utility; for 3 clams, she gets 24 units of total utility; for 4 clams, she gets 28 units of total utility; for 5 clams, she gets 30 units of total utility; and for 6 clams, she gets 26 units of total utility.