[adi92]

Happiness = (Desires Actualized)/(Desires Harboured)

Increasing the numerator tends to cause the denominator to increase as well

Craving for fewer things i.e. working on the denominator is usually more effective

[barrkel]

Don't agree. Happiness is not the absence of desire, and nor is it the memory of good events. Happiness is a process, a becoming, a journey rather than a destination.

Look into how game mechanics create fun, with challenges just difficult enough to be overcome with effort, and constant stream of rewards that reflect the effort expended, and you'll get the idea. From love to careers, the pattern of happiness is the same.