There is a certain structural "stiffness" which is a mix of regulation and culture but I don't believe it changed much. There was a big war in the middle of the 20th century that you might have heard of :-) and I feel like it upended things; poor countries like Sweden and Switzerland were able to spring ahead and the low energy point that the economy settled on was actually pretty solid for the second half of the 20th century: a resilient network of medium sized businesses with great socialization (the soi-disant "Mittelstand" of Germany is the most well known example). Unfortunately it didn't respond well to the global giants of the late 20th and early 21st century.