All else held constant, if farmers receive a subsidy for their corn, then this would cause

Rightward shift in the current supply of corn.

Explanation:

There is a shift in supply curve due to changes in production cost which causes higher or lower quantity to be supplied at a given price. Any advances in the factor of production which lead to increase in production and make it more efficient can cause shift in supply curve toward right. An increase in the quantity supplied leads to upward movement of the supply curve.

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