The “Buggy Whip Theory” is a reminder that even when investors correctly see the future coming, they rarely know which company—or which part of a new industry—will actually win. Don and Tom trace the lesson from ice delivery and buggy whips to streaming, airlines, and artificial intelligence. They also explain why rebalancing is portfolio maintenance rather than market timing, what falling municipal-bond prices really mean, and how to calculate international exposure as a percentage of the s...