Perfectly Inelastic Demand Curve    Let's examine a few unusual demand curves. The demand curve to the right is perfectly inelastic; demand does not change regardless of price, so = 0. There is never any change () in Q regardless of how much price varies, therefore Q = 0 always.

   Perfectly inelastic demand is very unusual, if not impossible, for large price changes, but may exist for modest price changes of some goods; such as prescription medication, addictive substances, and inexpensive personal care products. A large enough price increase will affect the quantity demanded for any good because simple affordability will be affected. Therefore, perfect inelasticity will disappear if the price changes significantly.

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