Ride sharing is a bit of a double-edged sword: It empowers people to use their own cars to make a couple extra bucks, but the low fares that draw many consumers are causing cabbies to see their ridership dwindle. Now taxi cab drivers in Denver have bound together to form a cooperative where each driver owns an equal share of the company, and has a say in what times they work, and business decisions for the co-op. The largest taxi co-op in Denver launched in 2009 and is 250 drivers strong. There are rumors that a second co-op will soon launch, adding some major competition to the already crowded sector.