It’s been more than 50 years since an American automaker had an initial public offering on a U.S. stock exchange. Earlier today, Tesla broke that barrier, and despite warnings from many analysts about the risky finances of the company — and its president — the stock has been holding steady at just over $18 after dropping from its $19 opening price to $17.50 almost immediately. The stock price was originally slated for $14-$16.