Palantir Technologies is, arguably, the priciest megacap stock of the century. For more than three decades, investors have been privy to no shortage of next-big-thing trends and game- changing innovations. Pie-in-the-sky addressable markets assigned to new innovations often lead to premium valuations for the companies leading the charge. While the development and eventual bursting of bubbles is something of a common theme on Wall Street, when examined over the long run, some bubbles have proved easier to sp ...