I do some backtesting today. In my algo I sue the VXX. But "suddently" the RETURN of my algo is quite different though I haven't changed anything in my algo. Fron the attached algo one can see the VXX is tradable from 2018 Jan. But 1 hour ago the VXX is tradable from 2009.
The VXX was ended in 2018. It was replaced by VXXB. But now the VXXB is repaced back to VXX. Really damn!
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