Thorstein Bunde Veblen was an American economist and sociologist, and a leader of the institutional economics movement. Besides his technical work he was a popular and witty critic of capitalism, as shown by his best known book The Theory of the Leisure Class.
Veblen is famous in the history of economic thought for combining a Darwinian evolutionary perspective with his new institutionalist approach to economic analysis. He combined sociology with economics in his masterpiece The Theory of the Leisure Class where he argued that there was a fundamental split in society between those who make their way via exploit and those who make their way via industry. In early barbarian society this is the difference between the hunter and the gatherer in the tribe, but as society matures it is the difference between the landed gentry and the indentured servant. The titular manifestation of those with the power of exploit is the "leisure class" which is defined by its lack of productive economic activity, it's commitment to demonstrations of idleness. As Veblen describes it, as societies mature, conspicuous leisure gives way to "conspicuous consumption", but both are performed for the sole purpose of making an invidious distinction based on pecuniary strength, the demonstration of wealth being the basis for social status.