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Surpluses drive prices up- shortages drive price down

Assume, in the Kansas City grain market, total demands for wheat and the net supply of wheat per month are illustrates here:

2040_Table for wheat.png

Why will $3.40 in this market not be the equilibrium price?  Why not $4.90? “Surpluses drive prices up; shortages drive them down.”  Do you agree?

Data from top to bottom:  -13; -7; 0; +7; +14; and +21.

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