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Americans blame political gridlock in Washington for the country's declining economic competitiveness and hold both Democrats and Republicans responsible, a Harvard Business School study released on Wednesday found.

The study noted that U.S. gross domestic product grew at a rate of about 2 percent since 2000, well below the 3 to 4 percent average in the prior half-century. It said a range of factors including a complicated corporate tax code, tangled immigration system and aging roads contribute to the slow growth.