Fanatics struck a deal to buy a federally regulated derivatives exchange and clearinghouse from BGC Group Inc. to partner on prediction markets for retail and institutional investors. Katherine Doherty has more on "Bloomberg Open Interest." -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news & analysis, up-to-the-minut ...