日本股市，突发！

Group 1 - The Nikkei 225 index initially rose and reached a historical high of over 45,000 points but later turned down, closing at 44,678.39 points, a decrease of 0.20% [2] - The U.S. has reduced the import tariff on Japanese cars to 15%, down from the previous 25%, effective from September 16, which aligns with the U.S.-Japan trade agreement [3] - The Japanese economy is showing signs of weakness, particularly in the automotive sector, leading to expectations that the Bank of Japan will maintain its current interest rate of 0.5% during the upcoming meeting [4] Group 2 - There is optimism in the market regarding the upcoming election of Japan's new Prime Minister, with former Economic Security Minister Sanae Takaichi being a leading candidate who supports increased fiscal stimulus and monetary easing [5] - The Liberal Democratic Party has announced that it will release the election announcement for the party president on September 22, with voting scheduled for October 4 [6]