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What is the futures spread ratio?
With the development of the futures market, its price discovery function is getting stronger and stronger. By analyzing simple price gap, general theoretical price gap and correcting theoretical price gap, the market trading strategy is formed. What is the price difference of that futures? The following is Bian Xiao's introduction.

What is the futures price gap? The positive price gap advertising market is expected to become stronger, while the negative price gap advertising market is expected to weaken in the future.

When the spread widens, the market strengthens the expected trend in the previous period. That is to say, when the positive spread expands and the negative spread narrows, the market expects the future trend to improve, and when the negative spread expands and the positive spread narrows, the future market trend will further weaken. The simple price gap can be used as a rough indicator of the trend of the star market.

The official price difference ratio is as follows:

Simple price difference = (stock index futures-stock index spot price)/stock index spot price