What Is Meant by Demand? The economic principle of demand concerns the quantity of a particular product or service that consumers are willing to purchase at various prices. Demand looks at a market's pricing and purchases from a consumer's point of view. On the other hand, the principle of supply underscores the point of view of the supplier of the product or service. What Is the Demand Curve? The demand curve is a graphical representation of the law of demand. It plots prices on a chart. The line that connects those prices is the demand curve. The vertical axis represents prices of products. The horizontal axis represents product quantity. Typically, the curve starts on the left side high up the vertical axis and descends across the chart to the right. The slope indicates that as prices decrease, demand, as shown by growing number of products purchased, increases.
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