东京股市日经股指开盘下挫

Group 1 - The Tokyo stock market opened lower on the 21st, with the Nikkei 225 index dropping over 700 points, influenced by the decline in the US stock market [1] - The Nikkei index has experienced a continuous decline for four trading days prior to this drop [1] Group 2 - Investor concerns regarding potential negative impacts of consumption tax cuts on Japan's fiscal situation have contributed to the pressure on the Tokyo stock market [3] - A significant rise in Japanese government bond yields has also made investors wary of high stock valuations, further impacting market sentiment [3]