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Carefully define the following terms and explain their importance.
a. Variable
b. Ray
c. Slope
d. Contour map
Aggregate Expenditure
The combined total of all economic spending, covering individual consumption, investments made by companies, governmental acquisitions, and the net balance of trade.
Aggregate Demand
The total demand for all goods and services within an economy at a given overall price level and within a given time period.
Money Supply
The total fund of money available in an economy at a fixed point in time.
Interest Rate
The cost of borrowing money, expressed as a percentage of the amount borrowed, paid by the borrower to the lender for the use of their funds.
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