Asked about the effect of withdrawal on the U.S. economy , 42 percent said it would hurt the economy ; 32 percent believed it would help the economy ; .
20 percent believed that U.S. would make no difference .
Asked about the effect of withdrawal on the U.S. economy , 42 percent said it would hurt the economy ; 32 percent believed it would help the economy ; and 20 percent believed that it would make no difference .