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Why so much noise about USA's credit rating being lowered?
Because the USA is the world's biggest economy - everybody in the world works with the USA (even if the american companies are not direct suppliers, they are surely somewhere in the supply chain). If USA credit rating is lower, that means american companies will find it harder to get loans to finance their business (i.e. the price of capital will be higher), and this will consequently lead to higher prices for partners of american companies, etc. This will certainly lead to slowdown of global economy. Plus, the lower credit rating also means that the USA govt. is less likely to pay off the debts (Chinese already stated they will diversify their bonds portfolio -i.e. they will start selling out american govt. bonds). This will lead to cuts in public sector in USA, less spending by the consumers, also probably less import from abroad and less travel which will affect - you get it - the "RoW". It's not by chance we have a saying in Europe, when USA sneezes, the rest of the world catches a flu!