Ivan receives an allowance from his parents of $10

each week. He spends his entire allowance on two

goods: ice cream cones (which cost $1 each) and tickets

to the movies (which cost $5 each).

a. calculate the opportunity cost of one movie in terms

of an ice cream cone.

b. Draw Ivan's consumption possibilities frontier. And

explain why the slope of the curve is constant?

c. What happens to the consumption possibilities

frontier if Ivan's allowance changes to $15?