Asklemmy

It definitely comes and goes in waves, I think. The interplay between infrastructure and economy is key. Your economy is dependent on things like ports, rails, pipelines, cables, roads, powerstations, etc. A country can't continually overhaul those things, and once they've invested in them, they are stuck for a while. This leads to weird situations where one country that's been behind for a little while can pass another country.

The US electrified first, and when Europe electrified, it used higher voltage, which allowed for more efficient home electrification, while many Americans are stuck with slow kettles, and clothes dryers, water heaters, furnaces, and stoves that run on fossil fuels. Similarly, widespread internet rolled out in the US first, but countries that came later were able to get higher speeds.

The economy of most countries, especially the US and China, is a house of cards. While there may be more investment, there's also more risk, and more inequality. Germany may be more stagnant, but it also may be more stable. It doesn't matter if the GDP per capita is higher in the US than Germany if the average person has no healthcare, paid for schooling, or social safety net.

One of the biggest lies (maybe more of a "spin" than a lie) that has been told over the past century is that the "economy" is the stock market, gdp, net import/exports, commodities, etc. Those are all important, and economists like to use them cause they are easier than getting to what really matters to most people.