economic
posted by Anonymous .
you buy only apples and bananas. Your budget is such that you can purchase 3 apples and 4 bananas or 9 apples and 2 bananas. Write down the equation for the budget line with bananas on the yaxis. Is that equation unique

Of course this is not unique. One could buy all apples, or all bananas. Notice that each banana is worth three apples, so one could buy 5 bananas, or 15 apples.