Abstract: There is a formula of happiness: Happiness = income / desire. In order to “maximize happiness”, two completely contrary approaches are possible: one is to maximize the numerator in the formula, i.e., to increase income, whereas the other is to minimize the denominator in the formula, i.e., to lessen desire. The former results in an “income-paradox” (or Easterlin paradox) typically in contemporary West. In contrast, the latter brings out a “desire-paradox”, which can be easy find in ancient China. These two paradoxes can be understood and consequently solved within one framework of economics.