Which of the following is not an interest-earning asset of commercial banks?

Refer to the figure above. What is the equilibrium price after the demand curve shifts to D2?

A) $20 B) $40 C) $60 D) $80

The economic way of thinking includes:

A) more attention paid to benefits rather than the costs involved in any choice. B) the assumption that individuals choose to maximize some objective. C) emphasis on how choices affect total values rather than marginal values. D) the notion that the world has solved the problem of scarcity.