Next, consider the impact of a price change from the initial equilibrium 
in Figure 6.10. Suppose that jazz now costs more—say $25. This reduces the purchasing power of the given budget of $200. The new jazz intercept is
reduced from 10 to 8 (= $200/$25)—the number of visits possible if Neal spends all his income on jazz. The budget constraint becomes steeper and rotates around the snowboard intercept H, which
is unchanged because its price is constant. The new equilibrium is at 
, which reflects a lower level of satisfaction because the affordable set has been reduced by the price increase. As explained in
Section Choice with measurable
utility, and 
define points on the demand curve for jazz (
and 
): They reflect the consumer response to a change in the price of jazz with all other things held constant. In contrast, the price
increase for jazz shifts the demand curve for snowboarding: As far as the demand curve for snowboarding is concerned, a change in the price of jazz is one of those things other than own-price
that determine its position.
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