Explanation

Earnings tend to revert to the mean fastest when they contain significant accruals components that are outliers. This is because:

• Accruals component: Represents non-cash accounting adjustments that can be manipulated or may not persist
• Outlier accruals: Extreme accrual values are less likely to be sustainable and tend to reverse more quickly
• Cash flow component: Is generally more persistent and less volatile
• Normal accruals: Are more likely to be sustainable and show slower mean reversion

When earnings are dominated by outlier accruals, the mean reversion occurs faster because these extreme accounting adjustments typically reverse in subsequent periods as they are not supported by actual cash flows.