Earlier quoted context omitted.
Couldn't it be a problem given the concentration of the S&P in these companies? At this point these companies make up a huge portion of 401k's for a huge chunk of Americans. How would it affect retirees if they dropped 40-50%, likely taking the market with them?
NVidia makes up 7.5% of the SP500. If it lost 50%, it would be a 3% loss for the index. The concentration is bad, but it would not cause a drop of 50% retirement funds by itself. If you take an all world index, it's even less. Still, if NVidia lost 50% of their market share, we would probably see a big collapse of the stock market. EDIT: to note, the top ten companies in SP500 make up an unprecedented concentration b…
They're mostly either AI proper, or hardware manufacturers benefitting from AI boom, or provide cloud services to AI companies...