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Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

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certain range, the demand estimates will also have a range<br />

of variation. All elasticity statements must be made with<br />

this band concept in mind.<br />

The diagram above was found to be relatively inelastic<br />

over the range investigated, with .3 being about an average<br />

value <strong>for</strong> decreases in air rates. This is a good deal<br />

more inelastic than current industry thinking suggests (in<br />

fact, the industry feels it is dealing with an elastic<br />

demand curve as is mentioned in Chapter I). In order to<br />

get large increases in air freight, percentage changes in<br />

excess of 15 percent must be assumed. Such changes would<br />

have caused some commodities that are exported in large<br />

tonnages by sea to shift to air. The method employed above<br />

is, however, not valid <strong>for</strong> large percentage changes because<br />

it cannot be assumed that the coefficients of the regression<br />

equations remain unchanged.<br />

The diagram below shows the cross demand relationship.<br />

It is also relatively inelastic over the range investigated.<br />

94

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