In people's impression, the "Big Seven" have played an indispensable role in the continuous rise of the US stock market over the past year. This is indeed beyond doubt, but at present, the technology stocks represented by the "Big Seven" are far from driving the rise of the US stock market. Last week, a landmark milestone was that heavyweight indices such as the S&P 500, after more than two years, broke new historical closing highs for the first time. This index assigns the same weight to each constituent stock.