On any downward-sloping linear demand curve, there are some points on the curve where demand is *elastic*, some points where it is *inelastic*, and one point where it is *unit elastic*.

Without even doing any math or knowing the exact formula for the demand curve, we can already figure out that the *elastic* part of the demand curve occurs on the *left side* of the demand curve. That is, at low quantities. Similarly, the *inelastic* part of the demand curve occurs at *high quantities*. It looks like this:

How do we know this?

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