A consumer has income of 30,000 a year and divides this income between buying food and spending on leisure. The average price of a unit of food is 15 and the average price of a unit of leisure if 10. Draw the consumer's budget constraint and draw the indifference curve if the consumer would like to consume leisure and food in equal amounts. Show the consumer's optimum. Discuss how an indifference curve can be drawn if goods are (i) perfect substitutes, and (ii) perfect complements.