If success causes happiness, then every employee who gets a promotion, every student who receives an acceptance letter, everyone who has ever accomplished a goal of any kind should be happy. But with each victory, our goalposts of success keep getting pushed further and further out.
The Effect Is The Cause
The formula is broken because it is backward. The relationship between success and happiness works the other way around; happiness is the precursor to success. Happiness, optimism and a positive mindset make us more motivated, efficient, resilient, creative, and productive, which drives performance upward.