Open-mindedness is not a passive virtue but a competitive advantage. "Strategic tolerance" is the deliberate act of engaging with opposing views and information you dislike. This process pressure-tests your own ideas against reality, making you and your business strategies more resilient and effective.
External shocks like wars or plagues don't destroy golden ages directly. The real danger is the subsequent societal shift from an open, exploratory "Athenian" outlook to a closed, protectionist "Spartan" one. This fear-based mentality stifles the innovation required for regeneration, leading to decline.
While societal decline can be a long, slow process, it can unravel rapidly. The tipping point is when the outside world loses confidence in a nation's core institutions, such as its legal system or central bank. This triggers a sudden flight of capital, talent, and investment, drastically accelerating the collapse.
Societal decline doesn't have to be a painful collapse. A wealthy culture can enjoy a long, comfortable "sunset period" by remaining open to importing technologies, ideas, and services from rising powers. The Byzantium Empire's 1000-year decline was sustained this way. The alternative is isolation and rapid decay.