A significant variant is the new institutional economics from the later 20th century, which integrates later developments of neoclassical economics into the analysis. Law and economics has been a major theme since the publication of the "Legal Foundations of Capitalism" by John R. Commons in 1924. Since then, there has been heated debate on the role of law (a formal institution) on economic growth. Behavioral economics is another hallmark of institutional economics based on what is known about psychology and cognitive science, rather than simple assumptions of economic behavior.