Online marketplaces have already eliminated so much inefficiency in our world. Dating (OK Cupid, Match.com), restaurant reservations (OpenTable), buying most physical goods (eBay) and countless other marketplaces serve both sides of the marketplaces (i.e. buyers and sellers) and provide value- typically making it more efficient to transact (or date!). Other marketplaces are eliminating inefficiency we didn’t even know existed. Uber and other taxi utilization apps are bringing efficiency to the $10 billion taxi market. That market is dwarfed by the size of the market for individual equity investments in private companies, which is $50 billion per year.