What Do Such Low Gas Prices Mean?

A couple of weeks ago, I wrote about the Russian Hooker Index, which had to do with the increasing cost of living in Russia. Meanwhile, however, the US is enjoying some very low gas prices. I am NOT complaining about the prices one bit! (Just wanted to be super clear on that point, because the last time I was able to fill my tank for $20, was about a decade ago.)
Much like the Russian Hooker Index, however, I am left wondering what economic forces are at play… or more ominous than that, what economic indicators for the future does this hold?
