There are companies that participate in the economy, and then there's Amazon. At this point, I half expect Amazon to announce it's getting into weather. Not forecasting it—selling it. Prime members would get sunshine delivered two days early while everyone else waits in line behind a thunderstorm. I've followed Amazon for years, and what fascinates me most isn't that it's become enormous. Plenty of companies get big. What amazes me is that Amazon somehow keeps convincing investors that it still has room to grow like an ambitious startup. Most corporations hit a certain size and spend the rest of their existence defending what they've built. Amazon looks at its empire, shrugs, and asks, "What trillion-dollar industry haven't we disrupted yet?" That attitude is exactly why I continue to believe Amazon remains one of the most compelling long-term investments in the market. The funny thing is that many people still think of Amazon primarily as the p...