This figure demonstrates an interaction effect between the two control variables, advertising and price: 
Definitions:
Legal Encyclopedia
A comprehensive written compilation that contains articles on legal topics.
Persuasive Authority
Persuasive authority refers to sources of law, such as cases from other jurisdictions, that a court may consider but is not obliged to follow.
Court Opinion
A written statement by a judge or a court of the reasoning and the principles of law used in reaching a decision of a case.
Law Review
An academic journal focusing on legal issues, typically run by students at a law school, publishing scholarly articles on various legal topics.
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