Abstract
AbstractWe uncover idiosyncratic cash flow risk as a dominant driver for pairs trading performance. The convergence probability and pairs payoff are negatively associated with pairwise idiosyncratic cash flow volatility. Further, pairs portfolio returns load negatively on market‐wide idiosyncratic cash flow volatility. This latter time‐series evidence helps explain a substantial part of the decline in pairs trading profitability in the US equity market since the 1990s. Our results are consistent with idiosyncratic risk representing a major holding cost for arbitrageurs when substitutes are close but imperfect.
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