International Markets Backtesting: Currency, Calendars, and Liquidity

International diversification can improve risk-adjusted returns, but it also introduces complications that domestic backtests do not face. Currency, trading calendars, and liquidity all affect the result.

Currency Considerations

When you invest across borders, returns come in two parts: the asset return and the currency return. A strong stock market can be wiped out by a weakening currency. Decide whether to hedge currency exposure or accept it as a separate source of risk and return.

Trading Calendars and Timestamps

Markets close at different times and observe different holidays. A strategy that uses global data must align timestamps carefully. Missing a holiday in one market can create lookahead bias or false signals in a multi-market model.

Liquidity and Data Quality

Liquidity varies widely across markets. Large developed markets trade with tight spreads, while smaller emerging markets can have gaps and stale prices. Use conservative fill assumptions and restrict your universe to liquid assets.

Backtest Global Portfolios in NeuroBacktest

With NeuroBacktest, you can test multi-market strategies across assets. Try: "Backtest a global equity momentum strategy using country ETFs from 2010 to 2024 with currency hedging." The engine handles the complexity so you can evaluate diversification benefits.