For any model of arbitrage, the average rate of return with predicting tools is higher than that without predicting tools.It is helpful for arbitrageurs to apply the strategy of basis time selection.

• 二、在任一套利模型中，有使用预测工具之平均获利报酬皆高于不使用预测工具，显示运用基差择时策略对于套利者而言，具有实质助益。