AAA credit ratings explained

As the US risks losing its AAA credit rating, we explain why the coveted top-notch grading matters.Where does the AAA rating come from?Rating agencies date back to the 19th century, and the heady early days of the US railways. In the rush to lay track and build railway stations across the American continent, investors craved information to help them profit without losing their shirts. Many railway companies went bankrupt, with some businessmen – among those later dubbed "robber barons"

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