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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

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desire to sell more than Qa if they receive a price higher than P a .<br />

With e transport cost of T o they will desire to sell in Market B only<br />

if the price they receive there is greater than P a + To ■ Pb .. But<br />

<strong>for</strong> prices greater than P b' excess demand in Market B is zero. There-<br />

.<br />

<strong>for</strong>e, <strong>for</strong> transport costs greater than T o there can be no flow of pro-<br />

duct from A to B, that is, the demand <strong>for</strong> transportation from A to B<br />

must be zero. Analogous reasoning will show that <strong>for</strong> transportation<br />

costs between zero and T o there would be a desire to ship quantities<br />

ranging from Q o to zero. This relationship is shown in Fig. 3.4 by<br />

the curve DTa,b.<br />

It results from the vertical subtraction of the<br />

excess supply curve from the excess demand curve and is the derived<br />

demand curve <strong>for</strong> the transportation of the product from Market .A to<br />

Market B. .<br />

After having derived the demand <strong>for</strong> transportation, it is only<br />

necessary to designate a transport rate or to specify a transport supply<br />

function to close the system and determine the post-trade prices and<br />

quantities. The solutions <strong>for</strong> the transportation market, the exporting<br />

market and the importing market are achieved simultaneously. This is<br />

also shown in Fig. 3.4. Our first assumption concerning the supply<br />

side of-. the transportation market is that there is a single transport<br />

industry which stands ready to carry any and all quantities of the<br />

product from A to B at some Constant price. This rate is represented<br />

-<br />

on the diagram as Tr. The intersection of the rate, line and the trans-<br />

port demand curve determines the quantity which will be shipped between<br />

the markets, Q l . Returning to the upper portion of the diagram we can<br />

observe the new, post-trade, product prices in the two markets, F a<br />

in Market A and P in Market B. If, instead of charging a fixed rate<br />

41

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