The required prevailing wages are determined prior to the filing of H-1B petitions and Labor Certifications.
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The prevailing wage determination that the DOL made for the green card case does not change over time. So when the green card is finally issued, that salary indicated on the PERM and I-140 is what must be paid (although it can be increased by a reasonable amount over time). For the H-1B processes during the interim, these are governed by the LCAs and wage determinations (if any) associated with each H-1B, so these required wages may be higher than the earlier one for the green card case.