> Objections below regarding salary differences between fields (scientists vs bankers) and costs of living in different areas can be addressed by considering average salary in each field and area.
I would also point out that this requirement is not without precedent and the data is already there, because there is exactly such a requirement for O-1 visas (well not exactly a requirement, but you get extra consideration if you are).
I would also point out that this requirement is not without precedent and the data is already there, because there is exactly such a requirement for O-1 visas (well not exactly a requirement, but you get extra consideration if you are).