> The US economy is by far the world's largest and now dwarfs the Eurozone.
Nominal, Eurozone, yes.
But, being the reserve currency boosts the exchange rate all by itself. I'd argue that this acts as hysteresis, that it adds strength that keeps it a reserve currency longer than it would if there was no memory in the system. Therefore, if anything does induce a shock, the PPP rate is more relevant when considering who might displace it; this other currency (or currencies) would then also get the same hysteresis benefit.
The EU, PPP, is about the same as the US (30 T), and I'd argue that "the EU" is important measure for near-future stuff rather than the current Eurozone, because the EU has the no-specific-time-constraint preference to become all Eurozone… except for the bits that opted out. But also some more neighbours who opted in without being in the EU. It's weird.
China, PPP, it is bigger than the US, 40 T by PPP. Not quite as big as the gap between the US and India, but close enough I had to get the calculator out I can't eyeball the ratio on a linear graph: https://upload.wikimedia.org/wikipedia/en/timeline/jfgbd60rb...
> To answer your question: the US economy is going to last a very long time yet. So far it has lasted hundreds of years. Please provide a comparison to any other economy that has lasted so long and done so well. You'll be able to name two or three examples maximum.
You didn't do well for all of those hundreds of years, if you squint hard enough to ignore the great depression you get to about 150 years, which basically means about the same as every other industrial economy that didn't have a war in the middle split it apart. If you don't do that (because the great depression really sucked), the half of Europe whose national boundaries explosively reorganised, and also the Soviet Union, wave hello.
The USSR is an important reference, because basically nobody saw the collapse coming until a year or two before it happened. It was unthinkable.
> In the moment people tend to get hyper emotional, hyperbolic. They think something fundamental is changing. That's almost always nothing more than personal subjective projection of what they want to have happen, rather than an objective assessment of reality.
All true.
> Back in reality the US has survived and thrived through drastically worse than anything going on in the present. The Vietnam era was far worse both socially/culturally and economically. WW2 was drastically worse. The Civil War was drastically worse. The Great Depression was drastically worse. But oh yeah sure, the US superpower is about to end any day now.
How many of those occasions did the US refuse to rule out military force with its primary set of allies in order to seize land supposedly to keep it safe from a nation that's now 33% richer than it is? The Civil War was not a time when y'all were a big player on the world stage, it was when Europe was busy carving everything up into colonies.