Off the top of my head, government mandates forcing people to stay at home would lead to a decrease in both as we saw with lockdowns in 2020. What this led to in some industries was either supply or demand being cut way more than the other (see toilet paper, the demand was not cut that much for at home use). In all industries though, gains from trade were reduced as individuals were not able to go to work and trade their labor, or go out and trade their money for goods and services. In essence, every is poorer as less gains from trade are happening.
Chapter 4 Curiosities
inquiry
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