Oil price is one reason. However the dollar is so weak be prepared to see everything in the US go up in the next year. Remember everything is made outside of the US now and the dollar isn't worth shit. The margins are getting too tight as companies have been selling things in the US for much lower than the rest of the world. If you think life is difficult now then wait until prices go up by 15% for everything.
Perhaps then the US will become less of a consumer driven throw away society.