"Karl Marx and Thorstein Veblen"
Thorstein Veblen
Public DomainThorstein Veblen - Credit: pil56: wikipedia

Karl Marx
Public DomainKarl Marx - Credit: Daniel Córdoba Bahle
Thorstein Veblen was a Norwegian sociologist and economist. He viewed the economy as an evolutionary process. He is remembered for the phrase "conspicuous consumption", referring to the habit of people from all walks of life of attempting to impress those around them by conspicuously demonstrating what they could afford to consume. 

 Karl Marx was a 19th century political philosopher. Along with Friedrich Engels, he wrote The Communist Manifesto. This was a condemnation of capitalism and basically suggested that the world's resources should be shared equally.

His ideas are summed up in the line "From each according to his ability, to each according to his needs".