Use the following to answer questions:
Figure: The Marginal Benefit Curve 
-(Figure: The Marginal Benefit Curve) Look at the figure The Marginal Benefit Curve. The total benefit of mowing four lawns is approximately:
Definitions:
Quantity Demanded
The total amount of goods or services that consumers are willing and able to purchase at a specific price level.
Capital Market
The input/factor market in which households supply their savings, for interest or for claims to future profits, to firms that demand funds to buy capital goods.
Investment
New capital additions to a firm’s capital stock. Although capital is measured at a given point in time (a stock), investment is measured over a period of time (a flow). The flow of investment increases the capital stock.
Demand Curve
A graph showing the relationship between the price of a good and the amount of it that consumers are willing to purchase at various prices.
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