2) Scenario 2: Great Depression 2.0. The economy shrinks by 25 percent over four years, or $3.2 trillion, plus $1.1 trillion in lost opportunity growth. Economic cost: $4.3 trillion. The market falls two thirds from its peak, losing $7 trillion in value from its current level, plus $3 trillion from not getting a rebound. Stock market cost: $10 trillion. Housing falls an additional $10 trillion from current levels, plus the lost opportunity of $2.5 trillion from a rebound. Housing cost: $12.5 trillion. Total four-year financial and economic cost of doing nothing: $26.8 trillion.
Now this is all a very rough guesstimate and doesn't include the costs of all sorts of other ramifications. Here is a fun one: the dissolution of China. Its economy is built for hypergrowth. A dramatically rising standard of living is both keeping the Communist Party in power and keeping the country together. Neither might survive a global economic meltdown. What is the economic impact of that? I don't know. My guesstimator just blew up.
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