Definition
Infrastructure is the set of durable physical systems — roads, bridges, transit lines, water and sewer networks, power grids, ports, airports — that carry the daily life of a society. Each piece is expensive to build, lasts for decades or centuries, and constrains the choices of every generation that comes after.
In The Power Broker infrastructure is treated as the most consequential thing a city government does. The buildings of a single block can be replaced; the bridges and highways and water mains of a metropolis cannot. Their layout is a kind of constitution written in concrete.
Why it matters
How it works
A piece of infrastructure binds the future in three ways. First, it consumes a large fraction of the available capital, so funding a new system means deferring all the alternatives that money could have built. Second, it changes land-use patterns around it — highways pull development to their interchanges, transit stations to their entrances — and those patterns become economically irreversible. Third, it creates user constituencies who will defend the system at any cost in subsequent political fights.
The combined effect is to make infrastructure decisions the highest-leverage choices a government makes. Get them wrong and the city pays for the mistake across a century of operating costs and missed alternatives. Get them right and the city receives a century of compounding economic and civic returns. The political invisibility of maintenance — the unsexy follow-on that determines whether the original investment actually pays off — is the part of the story most administrations get wrong.