The price of a good and its relative demand on that price determines the shape of a demand curve.
What is a demand curve?
The demand curve for a certain commodity shows the relationship between the price of that commodity and its quantity demanded at that price. The demand curve is generally downward-sloping.
It is drawn as price on the y-axis of the graph and quantity on the x-axis. The law of demand explains the shape of the demand curve by explaining an inverse relationship between the price and demand of a commodity.
Hence, the correct answer is the law of demand.
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