Final answer:
The given equation represents the demand function for a good, which relates the quantity demanded to factors such as price, income, and the price of a related good.
Step-by-step explanation:
The given equation represents the demand function for a good. It is a mathematical representation of the relationship between the quantity demanded (Q) and various factors such as the price of the good (P), income (M), and the price of a related good (PR). Using this equation, we can determine how changes in price, income, and the price of the related good affect the quantity demanded. SEO Keywords: demand function, quantity demanded, price, income, related good