Other high-end retailers have shown signs of faltering revenues or sales levels, but not Michael Kors, which went public almost exactly one year ago. It has rolled out new boutiques within larger department stores, and benefitted from increased recognition of the company’s brand name. Revenue was up 74 percent, as of the end of its fiscal second quarter in late September, while earnings doubled. In contrast to Facebook, here is an IPO that under-promised and over-delivered. Shares are up 87 percent this year.