Mean Reversion

In Kyle’s Historical Futurism research, mean reversion is the counter-narrative to pandemic-era extrapolation: the observation that e-commerce, after spiking during COVID, “fell right back in line with trend.” It sits alongside the related research note that “post-COVID will go back to normal,” drawing on Investor Amnesia’s lessons from previous epidemics showing how much reverts to normal. The idea functions as a caution against treating a temporary shock as a permanent regime change.

Context: Mean reversion is the tendency of a variable — a stock price, a growth rate, a ratio — to drift back toward its long-run average after deviating from it. It is a foundational concept in statistics and finance, and a frequent corrective to trend-extrapolation.

Where this appears

• Historical Futurism - Research — cited to argue e-commerce reverted to trend after its COVID spike (vs. extrapolating the spike forward)