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When markets drop 5% in a day, the amygdala (the brain’s fear center) triggers a fight-or-flight response. Being "unperturbed" means overriding this instinct through pre-commitment strategies. The hypothetical 2021 PDF would likely cite Dr. Daniel Crosby’s work, "The Behavioral Investor," which argues that unperturbed investors have:

Being unperturbed does not mean you do not care. It means you have a plan robust enough to handle the unexpected. It means recognizing that market fluctuations are merely noise, while the signal remains the long-term growth of the global economy.

“If the market falls 20% or more, I will rebalance by buying 10% more equities. I will not sell unless a company’s fundamentals permanently deteriorate.”