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U.S. savings bonds are seen in this arranged photograph taken with a tilt-shift lens to illustrate the theme of risk in Oradell, New Jersey, U.S., on Thursday, June 18, 2015. Photographer: Ron Antonelli/Bloomberg via Getty Images

U.S. savings bonds are seen in this arranged photograph taken with a tilt-shift lens to illustrate the theme of risk in Oradell, New Jersey, U.S., on Thursday, June 18, 2015. Photographer: Ron Antonelli/Bloomberg via Getty Images