Different sellers of wheat like MacDonald's farm and Mickey's Farm where they do not have an influence on the price marks the existence of pure competition in the economy.
Pure competition refers to a market where there is free entry and exit of buyers and sellers in the market selling exactly the same product with, no buyer or seller can influence the price.
Hence, if there is a pure competition in the wheat market, none from the aforementioned sellers would be able to sell enough so that they can influence the price.
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