The figure below demonstrates the _____ method. 
Definitions:
Units
Standard measures or quantities used to specify or quantify an amount of something.
Marginal Product
The additional output generated by expanding inputs by one additional unit, while holding all other inputs constant.
Fertilizer
A chemical or natural substance added to soil or land to increase its fertility and enhance plant growth.
Bushels
A volumetric unit of measure used primarily in the United States for agricultural products, representing a specific quantity.
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