The train, the automobile, and the microprocessor were all harbingers of exponentially increasing wealth and opportunity. Each technology lowered the cost of starting and running businesses, as well as giant ancillary businesses and markets.<p>The microprocessor preceded the gold rush we&#x27;re eulogizing here.<p>They all spawned brand new ecosystems that created entirely new opportunities for entrepreneurs to create wealth. The train even unified some nation states that didn&#x27;t exist.