Sterling one pound coins and bundles of 20 pound sterling banknotes are arranged for a photograph inside a Travelex store, operated by Travelex Holdings Ltd., in London, U.K., on Friday, Sept. 12, 2014. The pound, already suffering its worst month in more than a year, has the potential to tumble 10 percent should the Scots vote for independence from the U.K., according to economists surveyed by Bloomberg. Photographer: Matthew Lloyd/Bloomberg via Getty Images