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"Our capacity has fallen behind the demand curve," he said.

As such, it measures the extent of movement along the demand curve.

This change is reflected in a movement along the demand curve.

That is individual demand curves may not be valid at certain prices.

This means that the demand curve for both goods will move in the same direction, if the price changes.

You can't really find out what the demand curve is.

Consumer surplus is the area between the price line and the demand curve.

Now with a nonlinear demand curve, right, that same relationship doesn't hold.

Thus the price line is also identical to the demand curve.

Each of these groups typically have a much different demand curve.