It might be worth looking at the breakup for this job requirement as immigrant vs non-immigrant workers. Many job ads that mention "Phd" as requirement might be

It might be worth looking at the breakup for this job requirement as immigrant vs non-immigrant workers. Many job ads that mention "Phd" as requirement might be simply to complete the PERM process of already hired employee and not a real criteria. Secondly, in many cases bright kids from India/China/Korea come to USA to only do a Phd and end up on these jobs giving wrong signals that Phds are important.