Asset Pricing vs Asset Expected Returning in Factor Models
IGIER Working Paper No.. 651
42 Pages Posted: 12 Jul 2019 Last revised: 28 Jul 2019
Date Written: July 11, 2019
This paper proposes a new approach to factor modeling based on the long-run equilibrium relation between prices and related drivers of risk (integrated factors). We show that such relationship reveals an omitted variable in standard factor models for returns that we label as Equilibrium Correction Term (ECT). Omission of this term implies misspecification of every factor model for which the equilibrium (cointegrating) relation holds. The existence of this term implies short-run mispricing that disappears in the long-run. Such evidence of persistent but stationary idiosyncratic risk in prices is consistent with deviations from rational expectations. Its inclusion in a traditional factor model improves remarkably the performance of the model along several dimensions. Furthermore, the ECT – being predictive – has strong implications for risk measurement and portfolio allocation. A zero-cost investment strategy that consistently exploits temporary idiosyncratic mispricing earns an average annual excess return of 6.21%, mostly unspanned by existing factors.
Keywords: Asset Pricing, Asset Returns, Equilibrium Correction Term, Dynamic Factor Structure
JEL Classification: G11, G17
Suggested Citation: Suggested Citation