Let money income be $10 while the price of good 1 is $2 and the price of 2 is $1. Draw a budget line. Now draw the new budget lines according to each of the following changes in prices and income.
(i) The price of good 1 decreases from $2 to $1
(ii) The price of good 2 increases from $1 to $2 and income increases to $20
(iii) Both prices are doubled but income is tripled