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Basically my point of view on unicorns is that private companies which have sky high valuations, it doesn't really mean anything in the real world until it's marked to market. And there's only two ways things get marked to market in venture capital: Either a company is acquired by another company for cash or marketable security, or it goes public, and then it has reporting requirements and then the market will determine the value.

Source: www.sfgate.com
Basically my point of view on unicorns is that private companies which have sky high valuations, it doesn't really mean anything in the real world until it's marked to market. And there's only two ways things get marked