Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Price points are prices at which demand for a given product stays relatively high. Introductory microeconomics depicts a demand curve as downward-sloping to the right and either linear or gently convex to the origin. The downwards slope generally holds, but the model of the curve is only piecewise true, as price surveys indicate that demand for a product is not a linear function of its price and not even a smooth function. Demand curves resemble a series of waves rather than a straight line. The diagram shows price points at the points labeled A, B, and C. When a vendor increases a price beyond a price point (say to a price slightly above price point B), sales volume decreases by an amount more than proportional to the price increase. This decrease in quantity-demanded more than offsets the additional revenue from the increased unit-price.

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