…but $3.99 sells the most copies. Smashwords’ findings suggest that those $2.99 authors should price up by a dollar: “One surprising finding is that, on average, $3.99 books sold more units than $2.99 books, and more units than any other price except FREE. I didn’t expect this. Although the general pattern holds that lower priced books tend to sell more units than higher priced books, $3.99 was the rule-breaker. According to our Yield Graph, $3.99 earned authors total income that was 55% above the average compared to all price points.”.