> If the same workers in Bangladesh were to migrate to US

I think we have to factor in reality and external constraints if we're looking at this scenario.

An individual worker, maybe you can say that. But the entire segment of the developing-world workforce? If they were somehow able to immigrate en masse, it would disrupt the economy enough that I don't think we could predict the effects and say "they'll earn $7.25/hr".

Where they live, doing the work they do, they as individuals have almost no monetary value to western capitalist society (despite collectively generating uncountable value).