Imagine two identical cities. One gets a new park, the other gets a new high-speed train. Which one improves the lives of *more* people? And by how much? It's not as obvious as it seems.
Imagine two identical cities. One gets a new park, the other gets a new high-speed train. Which one improves the lives of *more* people? And by how much? It's not as obvious as it seems.
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