Suppose that watermelon, with price PW, and barbecue sauce are related goods. The expanded demand curve for barbecue sauce, then, is 
. Suppose that PW is $5 per watermelon. Use calculus to determine whether watermelon is complementary or a substitute for barbecue sauce.
Definitions:
Quantity Theory
A theory in economics that asserts the general price level of goods and services is directly proportional to the amount of money in circulation.
Equation of Exchange
An economic formula representing the relationship between money supply, velocity of money, price level, and an economy's output of goods and services.
Economic Problems
Issues arising from the allocation of scarce resources among competing uses, leading to questions of what, how, and for whom to produce.
Velocity of Money
The rate at which money circulates or turns over in an economy in a given period of time, used as an indicator of economic activity.
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