Which of the following may contribute to resistant strains of bacteria 
Definitions:
Price Elasticity of Demand
A measure of how much the quantity demanded of a good responds to a change in the price of that good, quantitatively defined as the percentage change in quantity demanded divided by the percentage change in price.
Expenditures on Milk
The total amount of money spent by individuals or entities on purchasing milk within a given period.
Perfectly Inelastic
A situation in which the demand for a good or service does not change regardless of a change in price.
Total Revenue
The overall amount of money generated from the sale of goods or services before deducting any expenses.
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