In the academic literature of economics, it is often seen that other conditions are the same, which means "all other conditions are the same". The coefficient most commonly used to explain a linear regression model usually refers to the marginal influence brought by the change of the variable to which the coefficient belongs when other variables are unchanged. In terms of economic significance, this analysis method can help us find out the role of each variable in a whole change or causal relationship. The inference basis of "relationship" in the whole science is the assumption that "other conditions remain unchanged", that is, "other conditions remain unchanged". It is either a causal relationship or a relationship. Latin.