A summary of last night's investment carnival: Berkshire Hathaway has promised to hold Japanese stocks for at least 50 years without selling them, has invested $20 billion, and will deepen cooperation in the future. Buffett said that there are not many opportunities in the current market, and there is no clear deployment plan for the $347.7 billion cash reserve, so he remains cautious. He downplayed the recent fluctuations in the US stock market, stating that it is not a big deal