1.Profit is equal to revenue minus cost, where revenue equals price times quantity of output,

while cost equals the wage rate times employment (assuming wages are the only cost of production). Assume that, on average, each firm produces 100 units of output a day, employs 90 workers, and pays a wage of $100 a day.

a)As the price of output rises from $80 to $90, $100, $110, and $120, show how the profitability of firms changes.

b)At which of these price levels will firms have an incentive to raise or lower output?

c)From these observations, construct an aggregate supply curve.

2.Use aggregate supply and demand diagrams to predict the change in GDP and the price level when the following occur:

a)New varieties of high-yielding grains are developed.

b)A round of collective bargaining in the industrial sector leads to relatively high

wage increases.

c)Pessimistic business forecasts lead firms to reduce their planned investment.

d)An announcement of major increases in social security retirement benefits leads

people to reduce their personal saving.

e)The population grows, increasing both the labor force and the demand for goods

and services.