1.1. Sammy has $60 in weekly income, the current price of clams is $5 per pound, and the current price of potatoes is $1 per pound. Both are normal goods for Sammy. For each of the following situations, construct a diagram that, like Figure 11-18, shows the substitution effect alone and also shows the substitution and income effects together. Put the quantity of clams (in pounds)

on the horizontal axis and the quantity of potatoes (in pounds) on the vertical axis.

a. The price of a pound of clams falls from $5 to $2.50, and the price of a pound of potatoes remains at $1.

b. The price of a pound of clams rises from $5 to $10, and the price of a pound of potatoes remains at $1.