Based on personal observation, I still believe it's more profitable to sell junks (China) to the world than to sell technology (the US) to the world! Everyone needs junks (cheap neccessities)... China sold so much junks to walmart. However, technology can be easily duplicated across border. Yea, one may argue that you have patent and shit... but look around all these asian countries, they can easily make some changes on the technolgy and came out with something similar or totally different. The profitability for technology product has been declining since the start of information age...
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