61.
Using Gabriel's budget line, and his indifference curves between horseback riding lesson and baseball lessons, and then changing of each activity holding his income constant, which of the following can be derived?

62.
According to Malthus population theory, which one of the following statement are not correct?

63.
A particular price level, there are no forces tending to move it either up or down, it means
1. the firm is in equilibrium.
2. the price is in equilibrium.
3. the equilibrium price of the firm.
4. the equilibrium price and quantity of a firm.
Select the correct answer

67.
A perfectly competitive firm should reduce output or shut down in the short run if market price is equal to marginal cost, and the price is

68.
In which of the following commodities, when a consumer spends so much that negative income effect overwhelms the positive substitution effect so as the underlying demand curve is positively sloped?

69.
If the average cost is falling then:

70.
The concept of price elasticity of demand measures