determinants of supply

change in resource prices

the price of StalkGrow, a fertilizer used in the corn production process, falls.

change in production technology

advancements in harvesting technology improve the efficiency of corn production

changes in taxes or subsidies

the government provides increased subsidies to corn farmers

change in prices of other goods that firms produce

farmers observe that the price of wheat falls (assuming many farmers divide their fields between wheat and corn production)

change in producer expectations

producers expect corn prices to be substantially lower later this year.

change in no. of sellers

thousands of new farmers begin to grow corn