As Japan's population has declined, Tesla deliveries have grown, a negative correlation of -0.979 that connects Japanese demographic decline to American electric vehicle adoption with the transpacific confidence of a chart that treats population loss and EV gain as inverse measures of the same historical moment. Japan loses people, America gains Teslas, and the chart maps both with the mathematical indifference of a coefficient that does not know what either country looks like.
Japan's population declined from about 127 million to under 124 million. Tesla deliveries grew from about 50,000 to over 1.8 million between 2015 and 2023. One declines, the other rises, nine data points. Japan's demographic crisis and Tesla's commercial success are products of the same decade but entirely different dynamics: Japan's birth rate, Tesla's battery costs. The shared variable is nothing except opposite directions during the same period.
Nine years of Japan shrinking and Tesla growing is a correlation that maps the global economy's asymmetry: one developed nation loses population because its young people do not reproduce, another produces electric vehicles because its economy enables technology adoption. The birth rate falls in Tokyo, the production line accelerates in Austin, and the chart spans the Pacific without understanding either endpoint.
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Want to learn more about why correlations like “Tesla vehicles delivered” vs “Japan total population” don't prove causation? Read our guide to statistical thinking.