A falling oil price is good for the US consumer and good for the US economy. Transport costs feed into the price of every physical product, so if oil gets cheaper, everything gets cheaper. If the oil price falls too far, however, the USA's recent fracking boom will come to an end. Forces are at play to end the USA's projected energy independence and return the country to dependence on the Middle East for its fuel supplies. The USA's long-term key supplier, Saudi Arabia, doesn't want to lose grip on its best customer.