Researchers say concern about the elections in the United States is increasingly affecting the American economy. Election campaigns can often affect financial markets. Studies show stock prices are more likely to jump or drop sharply during a campaign than at other times. Also, research shows that both business leaders and the general public delay decisions to buy or invest when the future is unclear. A research group called Macroeconomic Advisers says campaign promises about trade, taxes and other issues have a real effect on financial markets. The company is based in St. Louis, Missouri. Joel Prakken works for Macroeconomic Advisers. Speaking to VOA on Skype, he said investors seem to like Hillary Clinton, the presidential candidate of the Democratic Party. He said stock prices were often higher on days when public opinion studies showed her defeating the Republican candidate, Donald Trump.