If commuting is going to be compensated, then the compensation needs to be flat. If it costs more to employ people with longer commutes, those candidates will i

If commuting is going to be compensated, then the compensation needs to be flat. If it costs more to employ people with longer commutes, those candidates will invariably be discriminated against in regards to hiring/firing, and the candidates most effected will invariably be lower income, as longer commutes is such a common feature of lower cost housing. It would become an anti-social-mobility mechanism if not done right.