In 1994, noted economist Paul Krugman published an article attacking the idea of an "Asian economic miracle". He argued that East Asia's economic growth had historically been the result of increasing capital investment. However, total factor productivity had increased only marginally or not at all. Krugman argued that only growth in total factor productivity, and not capital investment, could lead to long-term prosperity. Krugman's views would be seen by many as prescient after the financial crisis had become apparent, though he himself stated that he had not predicted the crisis nor foreseen its depth. 
The causes of the debacle are many and disputed. Thailand's economy developed into a bubble fueled by "hot money". More and more was required as the size of the bubble grew. The same type of situation happened in Malaysia, and Indonesia, which had the added complication of what was called "crony capitalism". The short-term capital flow was expensive and often highly conditioned for quick profit. Development money went in a largely uncontrolled manner to certain people only, not particularly the best suited or most efficient, but those closest to the centers of power.
At the time of the mid-1990s, Thailand, Indonesia and South Korea had large private current account deficits