Question: 12. name three factors other than price that might affect the supply of an item

title: Supply (economics)
text: The supply function is the mathematical expression of the relationship between supply and those factors that affect the willingness and ability of a supplier to offer goods for sale . An example would be the curve implied by Q s = f ( P ; P rg ) ( \ displaystyle Q_ ( \ text ( s ) ) = f ( P ; P_ ( \ text ( rg ) ) ) ) where P ( \ displaystyle P ) is the price of the good and P rg ( \ displaystyle P_ ( \ text ( rg ) ) ) is the price of a related good . The semicolon means that the variables to the right are held constant when quantity supplied is plotted against the good 's own price . The supply equation is the explicit mathematical expression of the functional relationship . A linear example is Q s = 325 + P − 30 P rg ( \ displaystyle Q_ ( \ text ( s ) ) = 325 + P - 30P_ ( \ text ( rg ) ) ) . Here 325 ( \ displaystyle 325 ) is the repository of all non-specified factors that affect supply for the product . The coefficient of P ( \ displaystyle P ) is positive following the general rule that price and quantity supplied are directly related . P rg ( \ displaystyle P_ ( \ text ( rg ) ) ) is the price of a related good . Typically its coefficient is negative because the related good is an input or a source of inputs .