Yes, this time could be different. Past performance is not an indication of future performance. That said, it would be the first time something's gone parabolic upward (while lacking the fundamentals) without retracing, and I don't see any reason this time would be different.
[edit: Check this out: (1) https://imgur.com/a/HATGeWr (2) https://imgur.com/a/umQLsnK]
Will it eventually retrace? Probably. Almost surely. But it will probably not matter at that point relative to today.
I think we are in an era where stocks are mostly detached from fundamentals. Ask yourself who truly cares about fundamentals? It’s the uber wealthy who are trying to preserve their capital. Wealth disparity is huge so those numbers are fewer.
The Robinhood investors aren’t pouring over spreadsheets to decide where the best PE ratio tradeoff is most favorable. They aren’t trying to balance growth and income. They are literally buying whatever hyped them the most.
Now regarding the AMD chart. You should consider it in context of their defeat by Intel and subsequent turnaround. That, I think, drove the price movements shown in the chart. Did profit taking from amazing runs also matter? Probably. But you can’t ignore that AMD was nearly bankrupt and had to reinvent itself because it lost so much ground to Intel.
I hope given Tesla's new affinity with Bitcoin that what they want to do is "make it worse" lol. Tesla is literally selling its green energy credits to dirty car companies, then throwing it at Chinese coal miners.
The market goes through particularly bubblicious periods of pricing mania from time to time. It's happening now, it's happened before, and it'll happen again. I wouldn't read too much into it.
Prior to the pandemic stimmy money, poor people weren't investing and middle class folks were. When the pandemic hit, poor people lost their jobs, middle class folks kept them. Both poor and middle class folks received stimmy money. The middle class folks invested it.The whole run up there were trillions on the side-line, and folks who remember 2008 weren't about to let another V shaped recovery pass them by. They plowed money into whatever they could. Literally everything exploded in value last year. My personal trading account is up almost 14X on a 1-year basis today.
It's nothing to do with fundamentals, just a bubble. It'll revert in time, and then it'll grow again.