Krishna is a regular consumer of potato and tuna. For him, potato and tuna are both normal goods. The indifference curves related to his utility function exhibit the usual property of diminishing marginal rate of substitution.

1. Draw a draft of his indifference map or curve.

Suppose the price of potato goes up.

2. By means of diagram show how a change in the price of potato changes Krishna's income-consumption curve.

3. In what direction the Engel curve for potato move as a result of the change in price.