This is not from the news, but just my personal view of the situation.
After the WWII, Japan was destroyed, most cities, including Tokyo, flattened. The hard-working Japanese people rebuilt all very quickly. Thousands of construction companies appeared and prompted the economy. Japan had for aim to have an exceeding balance of payment and everything was made to reach this target, eve allowing industries to discard their wastes where ever they wanted. Loans were given very easily to foster investment. Japan first specialised in the heavy industry and finance, then, as the country got to work again in the 60's, went on to be a pioneer of high-tech, especially electronic.
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