Here's a hypothesis, although I don't have the data to back it up: When you bring foreign workers in, you have to train them, teach them skills, work culture,

Here's a hypothesis, although I don't have the data to back it up: When you bring foreign workers in, you have to train them, teach them skills, work culture, etc, that local workers already have. I would assume this leads to a situation where the job market simply becomes more saturated. Even if H1B regulations require giving above the prevailing wage, over the long term, job market saturation will suppress wage growth through more contention for limited positions, and they may in fact be saving themselves money by paying the higher wages to essentially "Water down the soup"