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Why is the push-pull theory of international migration out of date?

The push-pull theory of international migration can no longer adapt to the current situation. Due to the above defects of push-pull migration theory and the emergence of new types and situations of international migration after 1950s, the simple push-pull migration theory, which was born at the end of 19, cannot explain the complicated migration phenomenon after World War II. It is precisely for this reason that a new migration theory has emerged besides the push-pull migration theory.