Yesterday, a strike by Paris taxi drivers forced us to improvise. No taxi would take us… and the trains were said to be stopped… so we turned to the Internet. We tried a company with roughly $213 million in sales last year… and a valuation over $18 billion. That’s about 85 times sales. Compared to earnings, Uber’s stock is infinitely rich. Then again, Uber says sales are doubling every six months. And there’s still a lot of business to take from conventional cabs. According to industry experts, Uber took much of it yesterday. The taxi strike in Europe forced travelers, like your editor, to sign up for Uber.