His book, "Capital in the Twenty-First Century", rose to superstar status and became a best-seller. Thanks to his second book "Capital and Ideology", he has been compared to Karl Marx and a 19th-century German philosopher who studied capitalism's underpinnings and proposed remedies for the world. The fact that Thomas Piketty's books address the rise of inequality in modern society contributes to the author's popularity. The French author dismisses similarities to Karl Marx. Current scholarship and the media landscape refer to him as a modern European leftist.