A simple equation for a demand relationship might be the following:
QD = 220 - 4P
This equation gives a relationship between the desired quantity demanded, QD, and the market price, P, for some consumer or group of consumers. The consumer(s) represented
by this relationship will demand 220 units of this good if it
is free, and will want 4 fewer units for every unit of price increase.
None will be purchased if the price is 55 or higher.
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