US Mint coins produced

Between 2015 and 2021, the US Mint produced coins and Americans drowned in swimming pools with a statistical synchronicity that suggests either that spare change is somehow involved in aquatic safety, or that the universe is running out of ways to demonstrate the meaninglessness of correlation. Seven data points is barely a conversation, let alone a relationship, but what a conversation it is. One pictures a lifeguard tossing quarters into the deep end and calling it policy.

The US Mint's coin production fluctuates dramatically based on commercial demand, which itself tracks economic activity—more transactions, more coins needed. Production peaked in 2019, dipped sharply during the 2020 coin shortage (when the pandemic disrupted cash circulation), and rebounded. Pool drownings followed a loosely similar pattern: declining as pool safety improved, dropping further in 2020 when public pools closed, and ticking back up as restrictions lifted. Both metrics are proxies for how much normal life is happening at any given moment—coins circulate when people shop in person, and drownings occur when people swim. The pandemic briefly suppressed both, creating an artificial correlation in what is already an absurdly small dataset.

Seven data points sharing a pandemic dip is not a correlation so much as a coincidence wearing a lab coat. The coins and the drownings are both measuring the presence or absence of ordinary American life, and in 2020, ordinary life briefly stopped. That is the entire story. Change is not causation.