[US stock engine completely "dumb fire"? "Big Seven" market value quietly evaporated more than $1 trillion] Since the beginning of this year, the US technology industry "big seven" has dominated the rise of the S&P 500 index, these companies are once known as the FAANG Apple, Microsoft, Google, Amazon, Meta and later into this combination of Nvidia and Tesla. At one point in July, the combined market value of the "Big Seven" reached an eye-popping $11.5 trillion, almost three times the size of the German economy. Now, however, the main engine driving up the trend of US stocks this year is undoubtedly on fire...