Welfare trap
（重定向自Unemployment trap）
The welfare trap (or unemployment trap or poverty trap in British English) theory asserts that taxation and welfare systems can jointly contribute to keep people on social insurance because the withdrawal of means tested benefits that comes with entering low-paid work causes there to be no significant increase in total income. An individual sees that the opportunity cost of returning to work is too great for too little a financial return, and this can create a perverse incentive to not work.