Elizabeth Weise, writing for USA Today:
Of printed books, about 38% of the 800 million sold in 2016 were sold on Amazon.
For ebooks it’s about 75% of the 400 million
And for audio books it’s close to 95% of the 50 million sold.
The amount of books, ebooks and audio books sold by Amazon is pretty staggering.
And that’s just books alone, look at the other areas Amazon sells as well.