Abstract
AbstractBlack Monday caused an immediate disruption between index futures and stock markets, but it is not clear whether it had any lasting effects. Here we examine links between the markets that are sensitive to the liquidity shortages during Black Monday. By employing a tick‐by‐tick transactions data set of S&P 500 index futures trades and S&P 500 equity index we calculate the spot/futures basis and basis risk, the spot/futures lead/lag relation, and the bid‐ask spread. Evidence suggests that Black Monday had little continuing effect. On high‐volatility days, however, index arbitrage becomes more costly as prices are more sensitive to future trades.
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