Typically,the sales volume declines with an increase of a product price.It has been observed,however,that for some luxury goods the sales volume may increase when the price increases.The following Excel output illustrates this rather unusual relationship. 
For which of the following prices do sales predicted by the quadratic regression equation reach their minimum?
Definitions:
Social Exchange Theory
A concept in sociology and psychology that suggests human social relationships are formed by the use of a subjective cost-benefit analysis and the comparison of alternatives.
Leadership Outcomes
The effects or results of leadership actions on organizational performance, employee satisfaction, and overall achievement of goals.
Helpful, Useful
Attributes or qualities of being of service or benefit, contributing positively to a situation or solving a problem.
Norm Of Reciprocity
A social expectation that people will respond to each other in kind, returning benefits for benefits and responding with either indifference or hostility to harms.
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