Eric Ries' Silicon Valley-based Long-Term Stock Exchange opens for trading, nine years after "The Lean Startup" author first proposed it (Biz Carson/Protocol)

Biz Carson / Protocol:
Eric Ries' Silicon Valley-based Long-Term Stock Exchange opens for trading, nine years after “The Lean Startup” author first proposed it  —  Trading is starting on the Long-Term Stock Exchange.  Next up?  Attracting a listing.  —  A new stock exchange backed by Silicon Valley heavyweights …