What, if any, promotion(s) should I be running in my ads?

Promotions are a study in psychology, and Merkava Group is quite fond of the psychological aspect of advertising. Through educated hypotheses and rigorous A/B testing, we've determined the best promotions to run for a wide variety of services (Body Contouring, Injectables, Muscle Toning etc.,). Does BOGO work best? What about a percent or dollar figure off? What discount should I offer on Black Friday? These are all questions we've answered to supercharge our clients' performance.