This is what Japan's GDP/capita [1] looks like. I assume you're around my age because we grew up in a time when Japan was set to become the next economic super-power, and it looked like it might even surpass the US. But sometime around 1995, their economy peaked and they've been in pretty bad shape since then. Their current GDP/capita is about 25% lower (and falling) than it was in 1995. They work as a great argument against people who insist to just always buy the dip. What goes down does not always come back up.

By contrast this [2] is China's GDP/capita which is something really close to a vertical line. But for all the talk about economic systems, I think it's just because of good leadership and a motivated population. There's plenty of capitalist countries that aren't going anywhere, and there's endless examples of hybrid/social economic systems that have also gone nowhere. So I think there have to be explanations outside of the economic system itself.

[1] - https://data.worldbank.org/indicator/NY.GDP.PCAP.CD?location...

[2] - https://data.worldbank.org/indicator/NY.GDP.PCAP.CD?location...