OK I see. Thanks a lot for your clarification!

On Dec 11, 2:19 pm, Eugene Kononov <[email protected]> wrote:
> > JBT switched to the ES March 2010 contract, although the December 2009
> > contract has not expired.
> > Is this by random or does JBT 8 days before expiration switch to the
> > next contract?
>
> JBT acted as designed. Although the December 2009 contract has not yet
> expired, it has rolled over to the March 2010 contract, meaning that
> the daily volume of traded Dec 2009 contracts has exceeded the number
> of the Mar 2010 contracts. Take a look at the comments in
> MostLiquidContract.java.

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