What should the sum of "Yes" and "No" prices and percents be for a ForecastEx Forecast Contract?

The sum of the “yes” and “no” price for ForecastEx Forecast contract does not equal $1 because the sum excludes the spread provided to market makers for providing liquidity.

The sum of the “yes” and “no” percentages for ForecastEx Forecast contract does not equal 100% because the sum excludes the spread provided to market makers for providing liquidity.

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Is there a minimum or maximum trade size for ForecastEx Forecast Contracts?
Are ForecastEx Forecast and CME Event Contracts regulated?
What is the maximum risk on a long position in a ForecastEx forecast contract?
What should the sum of "Yes" and "No" prices and percents be for a CME Event Contract?