Exercise 2: Why the Tripling Elasticity Explains the Shortage's Severity — Possible Solution
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The 1973-74 shortage happened and was felt IMMEDIATELY, in the short
run - which is exactly the timeframe where gasoline's real elasticity
was at its most inelastic (-0.09). At that moment, drivers genuinely
couldn't reduce their quantity demanded by very much in response to
the reduced supply, regardless of how the price mechanism might
otherwise have handled it - a real -0.09 elasticity means even a large
percentage change in price or availability produces only a tiny
percentage change in how much gasoline people are willing to cut back
on.

Combined with Chapter 2's own price ceiling (which prevented price
from rising at all to help close the gap), this meant almost none of
the adjustment could happen on the demand side in the short run -
quantity demanded stayed stubbornly close to its original level even
as available supply fell, producing exactly the severe, visible
shortage (long lines, rationing) the real historical record shows.

The long-run elasticity of -0.31 - nearly three times larger in
magnitude - shows that demand COULD have adjusted much more
substantially, but only given real time: years for people to buy
different cars, change commuting patterns, or relocate. That
adjustment genuinely happened eventually, but it happened over years,
not within the days and weeks the actual 1973-74 crisis unfolded in -
meaning the short-run elasticity, not the long-run figure, is the
number that actually explains why the shortage was as severe as it
was at the time.

ANSWER: The shortage was severe because it happened within the
short-run timeframe, where gasoline's real elasticity (-0.09) meant
demand could barely adjust at all to the reduced, price-capped supply
- the much larger long-run elasticity (-0.31) shows demand eventually
could and did respond much more, but only over years, which is far
too slow to have softened the actual crisis as it unfolded at the
time.

WHY THIS WORKS AS AN ANSWER
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This connects the specific short-run number to the specific timeframe
of the real historical crisis, explaining why the long-run figure,
despite being real, doesn't undercut the severity argument.