Professor lang’s economic theory is good particularly in stock and housing markets. What he pointed out the bubbles of these markets have come truth. Now, China’s stock market has generally dropped 45 percent, and the house market dropped about 40%, and worse is especially in big cities like Shanghai, Guangzhou and Shenzhen. But professor Lang’s theory is not perfect, it has imperfections. Lang criticized most was China's "Planned Economics". When China first opened its door to the world, China was a poor and under developed country. With its limited amount of money China seemed to have no choice but use it in the most significant area. So, its planned economic was understandable. International economic analysts considered China’s planned economics had safely passed many international monetary crises. The next significant point Lang criticized China’s economics was that China invested too much into the Foundation Construction (基礎建設) like building the airports, sea port, railroads and highways etc. but neglected other industries so as to make the whole country’s industries unbalanced. It may be true that China emphasized on some foundation constructions more than the others, but China must do so the reason is: certain amount of money can only be used in certain number of projects if there is no surplus. There is no way that China can develop everything at the same time. Now, it has become apparent that those foundation constructions become the shiny displayed windows of China. It represents China’s advancement; it brings China into the threshold of an advanced country. Lang's economic theory is from the western’s "freedom of economic” (自由主義經濟) which is good when a country’s economics is not very well developed, and when the international relationships are not so complicated. When there is no interference from outside, and no economic crocodiles (國際經濟大鱷) are stalking. In fact, these two economic vampires are all around in the developing countries. We can give two examples herewith: The first happened in the ninetieth Japan of the last century, when Japan's economic was climbing to the top, one Western greedy country together with its economic crocodiles using its political and economic pressure to buy out or to annex Japan's national sources, big business and then force Japan's currency to evaluate. By doing so, Japan’s decades hardworking economic fruits were swallowed thereafter. Since these international economic crocodiles bought in low by sell out high they absorbed large amount of money from Japan leaving that little country’s economic in depression for almost twenty years. The newest example is the Vietnamese economic collapse (or almost collapse). That Western country and its crocodiles used the same tactics to eat up Vietnam’s economic achievement. If China did not adopt the Planned Economic System, China might suffer the same results as Japan and Vietnam did. So, I think China has done the right thing that China has evaded the economic crisis, and protected the pockets of its people. Professor Lang did not mention this on his lectures. His theory could bring China into an economic chaos if China follows his idea indiscriminatingly.