US broiler chicken productionUS self-published books per year
Between 2010 and 2021, self-published books and broiler chicken production both grew in the US, correlating at 0.9629 across nine data points. America is simultaneously producing more reading material and more poultry than ever before, and the correlation describes a nation of industrious abundance: we cannot stop writing, and we cannot stop eating chicken. Both activities have been democratized—anyone can publish a book on KDP, and chicken has become the cheapest protein available—which means volume has exploded in both categories with predictable consequences for quality.
Self-published books grew from 150,000 to over 4 million titles annually through Amazon KDP. Broiler chicken production grew from roughly 37 billion pounds to over 44 billion, driven by demand growth and production efficiency. Both are volume-growth stories across nine years.
Nine years of two industries both increasing volume will produce a strong correlation. The self-published book and the broiler chicken share a growth direction and a nation of expanding output.
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Want to learn more about why correlations like “US broiler chicken production” vs “US self-published books per year” don't prove causation? Read our guide to statistical thinking.
