That's what happens when big government sets laws that interferes with the free market. There are so many implications that come out of this from an economic standpoint that it would take too long to explain in a forum thread.
Just for fun..... Let's pretend there existed a magic wand that would make Romney really happy.....

He could wave said magic wand and make all the immigrants automatically self deport. What would happen? In short it would be like a domino effect. All across the USA, consumers would see a significant increase in the prices of most goods and services. Our cost of living as we know it would certainly see a significant increase, while our income would remain the same at best.
I could go on about other government policies that interfere with the free market in a negative way, and in the end just increases our cost of living but I don't want to take away from the thread