Milton Friedman's Free To Choose proved capitalism is superior to socialism-
[reason.com]
What’s so clear reading or listening to him, his ideas have only grown more relevant over time. He more or less revived free-market economics and rescued it from the swamp of Keynesian thought. He also helped jump-start the economies several Eastern European countries that had no idea which way to turn once the Iron Curtain fell. “This free market... how you set prices with no planning commission?” He had Estonia and Moldavia up and running within a decade.