Humans function through their network.
Our unique ability to abstract, tell stories, and orient ourselves around the stories allow us to function like a single organism.
That is what the world economy is.
We communicate with words and prices to shift allocation of resources to the highest and best use - at least in a purely free market.
In that context, the railroads and resulting interconnection - the ability to move things around were key to economic development.
-- an excerpt from the Saylor Series Episode 2 - the Rise of Man through the Dark and Steel Ages, its 2-minute version can be found here 

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The Saylor Series Episode 2 - The Rise of Man through the Dark and Steel Ages (Robert Breedlove's What Is Money Show) — 2 minute bitcoin
The Saylor Series Episode 2 condensed from 13,546 words into just 476. This 2-minute bitcoin read follows Michael Saylor
