In April, eggs cost $2 per dozen, wine costs $1 per bottle, your income is $120, and you buy 50 dozen eggs. In May, eggs cost 50 cents per dozen, wine still costs $1 per bottle, and your income is $60.
a) Is it possible to tell in which month you are happier?
b) Is it possible to tell in which month you buy more eggs?
Justify your answers with indifference curves.