Well, you're talking about the effects of the threat of unionization, which I would agree is pretty clearly effective in driving labor costs up. I'm wondering more about the effect of established unions and companies or industries that employ both union and non-union labor; in the case that the union exists, has negotiated wages, and the company or industry employs both union and non-union labor, it seems unreasonable that non-union labor prices should float relative to union-negotiated prices, assuming that there is a sufficient supply of non-union labor.