Thirty employed single individuals were randomly selected to examine the relationship between their age (Age) and their credit card debt (Debt) expressed as a percentage of their annual income. Three polynomial models were applied and the following table summarizes Excel's regression results. 
Suppose the restriction β3 = 0 is imposed on the cubic regression model Debt = β0+ β1Age + β2Age2+ β3Age3+ ε. What regression equation is obtained under this restriction?
Definitions:
Willingness To Pay
This is the maximum amount a consumer is prepared to spend on a good or service, reflecting the value the consumer places on it.
Demand Curve
A graphical representation showing the relationship between the quantity of a good consumers are willing and able to purchase and its price.
Supply Curve
A graphical representation showing the relationship between the price of a good and the quantity of that good that suppliers are willing to offer for sale.
Consumer Surplus
The imbalance between the funds consumers are willing to dedicate to a good or service and the funds they actually dedicate.
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