Every time the government introduces an economic policy, it will change the income expectations of some interest groups. Out of self-interest, these interest groups always try to offset the loss caused by the policy through various behavior choices. At this time, if the government really changes the original policy, the result will not only invalidate the policy issued by the government, but also make the government's ability of economic regulation and control decline continuously due to the loss of credibility.
The main statement of this passage is 'Factors that must be considered when formulating economic policies'.