Final answer:
The coefficient of x² in the revenue function r=0.5x²−200x represents the rate of change of revenue as more goods are sold, signaling a quadratic relationship in revenue growth.
Step-by-step explanation:
In the context of the revenue function r=0.5x²−200x provided by the student, the coefficient of x², which is 0.5, represents the rate of change of revenue with respect to the quantity of goods sold as the number increases. This is because the term x² signifies a quadratic relationship in the equation, which means that the revenue does not grow at a constant rate, but accelerates as the quantity increases. The coefficient tells us how much the revenue will increase for each additional unit squared, which can affect the overall shape of the revenue curve and indicate important economic factors such as economies of scale.