Any system that combines skill and luck will
exhibit mean reversion over time.
They note that periodic rebalancing to fixed asset class weights tends to perform well in trendless markets
exhibiting mean reversion but suffers during extended trends.
Whether or not you take valuations into account, the real, annualized, total return of the S&P 500
exhibits MEAN REVERSION.
Not exact matches
Economic volatility
exhibits strong
mean reversion.
Relative valuation levels for most factors
exhibit strong
mean reversion.
Valuation - based tactical asset allocation has proven very hard to execute over time, for a simple reason: Asset - class valuations do not
exhibit much
mean reversion.
Are you stating that the data generating process governing the instrumental record must
exhibit mean -
reversion (i.e. a necessary condition for stationarity)?