The poor of the developing world are not as poor as they appear. Hernando de Soto, a Peruvian economist, argues that the world's poorest citizens collectively hold trillions of dollars in assets — houses they have built, businesses they have established, crops they have cultivated — but that these assets remain economically inert because they exist outside the formal property system. Without legal title, a house cannot serve as collateral for a loan, a business cannot be incorporated and scaled, and land cannot be efficiently bought or sold. De Soto calls this the mystery of capital: why does capitalism thrive in the West but fail almost everywhere else? His answer is that Western nations developed, over centuries, an integrated system of property law that allows assets to be represented by titles, shares, and other formal instruments — what he calls a process of converting physical assets into capital. Developing nations, by contrast, maintain property systems that exclude the majority of their citizens, forcing the poor into extralegal arrangements that function locally but cannot connect to the broader economy. De Soto supports his argument with fieldwork conducted by his research institute in countries including Peru, Egypt, Haiti, and the Philippines, where his teams documented the Byzantine bureaucratic procedures required to formalize property — processes that in some countries took hundreds of steps and several years. The book challenges both left-wing critiques of capitalism and right-wing assumptions that free markets alone will generate prosperity, arguing instead that specific legal and institutional reforms are necessary to unlock the economic potential that already exists among the world's poor.