Three Criteria for Income Distribution:

1. Equity (Fairness):
   The principle of equity ensures that income distribution is fair and just within the society. There are two types of equity: horizontal equity and vertical equity. Horizontal equity ensures that individuals with similar income or circumstances are taxed similarly, while vertical equity ensures that those with higher incomes contribute more to government revenues. This criterion aims to address income inequality and ensure that wealth is distributed in a manner that reflects the ability to pay.
2. Efficiency:
   Efficiency in income distribution refers to the idea that redistribution should be done in a way that does not disincentivize productivity or economic growth. This means that the government should implement policies that ensure wealth is redistributed without significantly distorting market outcomes or creating inefficiencies in labor supply and investment. An efficient system of redistribution would balance economic incentives with social welfare.
3. Adequacy:
   Adequacy as a criterion focuses on ensuring that income redistribution policies provide enough resources for individuals to meet their basic needs. The goal is to reduce poverty and ensure that every citizen has access to essential goods and services, such as food, shelter, healthcare, and education. Adequacy is crucial in preventing extreme inequalities that could lead to social unrest and economic inefficiency.