Currency Network Risk Mykola Babiak* Jozef Baruník** Lancaster University Management School Charles University First draft: December 2020 This draft: July 22, 2021 Abstract This paper identifies new currency risk stemming from a network of idiosyncratic option-based currency volatilities and shows how such network risk is priced in the cross-section of currency returns. A portfolio that buys net-receivers and sells net- transmitters of short-term linkages between currency volatilities generates a significant Sharpe ratio. The network strategy formed on causal connections is uncorrelated with popular benchmarks and generates a significant alpha, while network returns formed on aggregate connections, which are driven by a strong correlation component, are partially subsumed by standard factors. Long-term linkages are priced less, indicating a downward-sloping term structure of network risk. Keywords: Foreign exchange rate, network risk, idiosyncratic volatility, currency predictability, term structure JEL: G12, G15, F31 arXiv:2101.09738v2 [q-fin.GN] 21 Jul 2021 *Department of Accounting & Finance, Lancaster University Management School, LA1 4YX, UK, E-mail:
[email protected]. **Institute of Economic Studies, Charles University, Opletalova 26, 110 00, Prague, CR and Institute of Information Theory and Automation, Academy of Sciences of the Czech Republic, Pod Vodarenskou Vezi 4, 18200, Prague, Czech Republic, E-mail:
[email protected]. 1 1 Introduction Volatility has played a central role in economics and finance. In currency markets, a global volatility risk has been proposed by prior literature as a key driver of carry trade returns. While the global volatility risk factor is intuitively appealing, there is little evi- dence on how idiosyncratic currency volatilities relate to each other.