Global Investors breathed a collective sigh of relief, following news that U.S. politicians had reached tentative agreement on raising the government's debt limit - avoiding a possible default. Financial markets around the world reacted positively. But, the euphoria did not last long. In Asia, key indexes from Hong Kong to Japan were up sharply after the U.S. announcement. Gold prices dropped more than $15, oil saw its biggest gains in two months and the dollar strengthened against the euro and the yen. But investment analyst Martin Hennecke said the optimism was not likely to last. "The immediate reaction is positive in the Asian markets so the markets are up," said Hennecke. "However, before one becomes overly euphoric, we would caution that increasing the debt limit means increasing the debt - and too much debt was the problem in the first place in the United States." On Wall Street the euphoria quickly gave way to reality. The Dow Jones Industrial Average...