What is represented by an individual demand curve?

An individual demand curve visually represents the quantity of a good or service that an individual consumer is willing and able to purchase at different price levels. This relationship illustrates how demand for a product typically decreases as the price increases, reflecting the law of demand. The curve is downward-sloping, indicating that as prices fall, consumers are willing to buy more of the product, and conversely, as prices rise, they tend to buy less. Hence, option C accurately describes the purpose of the individual demand curve.

In contrast, the other options address different concepts in economics that do not pertain specifically to the individual demand curve. For instance, variations in prices over time refer to price changes and trends rather than individual preferences at different prices. The relationship between income and pricing strategies involves a broader analysis of consumer behavior and firm pricing tactics, which is not directly represented by a demand curve. Lastly, aggregate demand pertains to the total demand in the economy or market as a whole, combining the demand of all consumers rather than an individual perspective.