Why is foreign trade so profitable and the threshold is so low, but no one does it?

The threshold of foreign trade is not high, but why not open a foreign trade company? If you are now the boss of a foreign trade company, you will think with your head. First, strong business ability will definitely make money, but what will happen if the business ability is poor or you don't make orders? In addition, it used to be 360 lines, but now it is far more than 360 lines. And we must choose the right products in the industry. Ha ha.