The fate of Uber’s stock is a verdict on the winner-take-all venture capital model that dominates Silicon Valley. : The fate of Uber’s stock is a verdict on the winner-take-all venture capital model that dominates Silicon Valley. Mr. Desai, a professor at Harvard Business School and Harvard Law School, is the author of “How Finance Works.” Uber’s initial public offering — the biggest in a year of blockbusters — is yet another chance for Uber and its detractors to sell their competing ideas of what this company represents.