Amazon annual revenueUS self-published books per year
It is a curious fact, and one that ought to be more widely known, that the amount of money Amazon makes in a year and the number of people who decide to publish their novel on the internet move together with the precision of a couple who have been married so long they've started finishing each other's sentences. One might assume these are unrelated phenomena, separated by the gulf between a trillion-dollar logistics empire and someone's fever dream about dragons in Brooklyn. And yet here they are, nearly perfectly correlated, which suggests either that the universe enjoys a very specific kind of joke, or we are all pattern-seeking creatures desperate to connect dots that happen to be standing next to each other.
The honest answer is almost certainly banal: both are downstream effects of the same river, which is to say economic confidence and internet adoption. As Amazon's cloud services, retail dominance, and advertising networks have expanded—growing from roughly $35 billion in revenue in 2010 to over $570 billion by 2023—the infrastructure for self-publishing has become cheaper, faster, and more culturally visible. It's the same story that explains why pizza delivery apps and craft cocktail recipes both exploded in the 2010s. We're not watching Amazon cause amateur authors; we're watching the same rising tide of digital infrastructure, disposable income, and the democratisation of tools lift both boats simultaneously. The real magic is that 98 percent correlation requires almost no magic at all, just two things riding the same economic wave like surfers who've never met but happen to paddle out on the same Tuesday.
What we've stumbled onto here is less a causal relationship and more a beautiful coincidence of scale and timing, the kind of thing that makes you wonder how many other pairs of unrelated things are doing the same dance without anyone noticing. Amazon's revenue and self-published books per year have become entangled not because one causes the other, but because they're both expressions of the same era of cheap storage, cheap distribution, and cheap confidence. Sometimes two things just move together for a while. That's all this is.
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Want to learn more about why correlations like “Amazon annual revenue” vs “US self-published books per year” don't prove causation? Read our guide to statistical thinking.