Cost of Katrina ~135 billion in 2017 dollars (https://www.thebalance.com/hurricane-katrina-facts-damage-and-economic-effects-3306023 … + inflation scaling). Don't panic yet.https://twitter.com/Revkin/status/901975714798415874 …
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That assumes long-term rational thinking. Also IRL what happens is that areas get requalified as "low-" or "no-risk" to avoid insurance.
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