The Introduction deals with the place of sovereign landlords, in particular landlords that ruled over some of the most productive oil regions in the world, in the history of the twentieth century. Petrostates are often disliked because of their “rentier state” status. They have the aura of a “pariah state” compared to the other “productive” members of the international community. Land rent has been progressively marginalized as a topic of mainstream political economy thinking, and has generally negative connotations for Liberal and Marxist intellectuals and economists alike. The general dislike for rent as “undeserved wealth” lies very deep in widely engrained religious and cultural views all over the world. Variations of the biblical admonition that “if anyone is not willing to work, neither should he eat” exist so many different cultures. This book holds no such prejudice against land rent and sovereign landlords. It simply observes that land rent exists because the Earth is finite and because much of the ecosphere has been split up in the twentieth century among sovereign landlords called nation states. Each of these nation states has peculiar geographical and cultural characteristics and has to deal with them. The existence of petrostates such as Venezuela, Saudi Arabia, Nigeria, and Iran, nation states with such an important regional and global role, while at the same time crucially dependent on international land rent (a rent that comes from exports), cannot be easily dismissed as the outcome of a quirk of international political economy that has generated extravagant regimes.