By offering wages appropriate for the economy your fellow citizens are accustomed to, as opposed to the economy citizens of other nations are accustomed to.
Saw a university (like 7 years ago) H1B'ing postdocs for like $30k, maybe $35k a year, by valuing the benefits at like $20k. It was kind of a joke IMO.
That is the prevailing wage for postdocs, domestic or foreign.
The abuse of postdocs and grad students exists, but is entirely unrelated to H1B and foreigners. They paid them poorly even before the country was flooded with foreign students.
