> they will be taking a lot of people's 401k's with them
The US needs to stop allowing this kind of thing to happen, where the economy gets so hyper-concentrated in a few companies that they can hold the entire country's (and arguably much of the world's) retirement savings hostage.
We had that happen in the late 90s/early 2000s with Nortel. Before they collapsed (and infamously devastated their current and former employees' pensions in doing so), Nortel represented a THIRD of the TSX. The TSX responded by capping any individual stock at 10% of the exchange's overall value, with a forced rebalancing in the event that cap is struck.
At this point, that 10% is probably higher than it should be, since it doesn't account for entire extremely-well-funded sectors being caught up in a hype cycle like AI's, the sum of whose component stocks could easily exceed 10%.
We had that happen in the late 90s/early 2000s with Nortel. Before they collapsed (and infamously devastated their current and former employees' pensions in doing so), Nortel represented a THIRD of the TSX. The TSX responded by capping any individual stock at 10% of the exchange's overall value, with a forced rebalancing in the event that cap is struck.
At this point, that 10% is probably higher than it should be, since it doesn't account for entire extremely-well-funded sectors being caught up in a hype cycle like AI's, the sum of whose component stocks could easily exceed 10%.