Stocks have been on a terrific run over the past decade. But the years ahead might not be quite so spectacular. A rising chorus of market watchers has recently sounded the alarm about the possibility

Last week, RBC Capital's Paul Treiber boosted his fair-value assessment of Shopify to $100 per share, well up from his preceding level of $85. In doing so, he maintained his outperform (read: buy) recommendation, as the new price target sits a comfortable 21% over the stock's most recent closing price.