1. Is there any problem for countries to run persistent large trade deficit? How is the case for the U.S. different from other countries?

2. What is the fundamental conflict between the U.S. and China trade relation? If free trade is win-win for both countries, what are the economic reasons for protectionist policy and trade war?

3. What can be learned from trade history for protecting domestic infant industries and disadvantaged businesses? 

4. What are the major U.S. trade laws against "unfair" trade practices from a foreign country? Were the sanctions effective?