According to the simple supply-side model of international migration, the increase in source country wages caused by migration does not imply that source country welfare improves because:

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The simple supply-side model of international migration suggests that when workers migrate, it can lead to an increase in wages for those remaining in the source country due to reduced labor supply. However, this model also indicates that the owners of non-labor factors (such as capital or land) in the source country may experience losses because the reduced labor supply can lead to lower productivity or higher labor costs, negatively impacting their profits. This dynamic can prevent an overall improvement in source country welfare despite the increase in wages for some workers.

According to the Simple Supply-Side Model of International Migration, the Increase