Global emails sent per dayUS broiler chicken production
As global email volume has grown, US broiler chicken production has grown, a correlation of 0.983 that connects the inbox to the chicken coop with the agricultural precision of a chart that treats spam emails and chicken breasts as equivalent outputs of an expanding economy. The email is sent, the chicken is processed, and both numbers climb because a growing global economy produces more of everything simultaneously.
Global emails grew from about 250 billion to over 350 billion per day between 2015 and 2022. Broiler production grew from about 41 billion to over 45 billion pounds. Both are smooth upward curves in a growing economy: emails because more commerce generates more notifications, and chicken because population growth drives protein demand. Eight data points, both up, driven by different aspects of the same expanding economy.
Eight years of emails and chicken is a correlation between two outputs of economic growth: digital communication and protein production, both scaling with the same global expansion. The email is sent by a human, the chicken is processed by a machine, and neither is aware of the other's contribution to the GDP. The inbox fills. The coop fills. The economy hums.
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Want to learn more about why correlations like “Global emails sent per day” vs “US broiler chicken production” don't prove causation? Read our guide to statistical thinking.