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Because the potential returns appear to be greater in poorer countries than in the developed world, modern economic theory implies that rich countries should continually invest in poor countries until returns balance out. In fact, this doesn't happen. Economist Robert E. Lucas Jr. asks why in his groundbreaking 1990 article, "Why Doesn't Capital Flow from Rich to Poor Countries?" The question has become known as the Lucas paradox. Lucas analyzes this, focusing especially on the role of human capital.

Michael R. Gottfredson and Travis Hirschi's 1990 work, A General Theory of Crime, assessed contemporary work in criminology, while also introducing a new, comprehensive theory of crime. At the time, researchers tended to focus on environmental factors that led to crime, not on the criminals themselves. Additionally, crime researchers came from different disciplines and inclined towards thinking about crime only from their particular perspective. This meant ideas about what caused crime, and how to prevent it, were often in conflict.

First published in 1996, Our Ecological Footprint sets out a powerful model for visualizing and measuring humanity's impact on the Earth - the ecological footprint - with the aim of reducing the harm we are causing the planet before it is too late. Although numerous organizations, governments, and individuals worldwide have now adopted the concept of ecological footprinting, the idea has also proved to be controversial.

Economist Amartya Sen's 1997 work Development as Freedom presents a "middle way" approach to how we should look at international development, based on the idea that its success or failure cannot be measured by income alone. Having grown up in India, Sen brings his own understanding of what poverty really means to the issue, arguing that above all, the process and goal of development must be human freedom. He backs up this idea through his concept of "capabilities."

US psychologist Abraham Maslow's 1943 essay "A Theory of Human Motivation" established his idea of humanistic psychology as a "third force" in the field. He outlined a new approach to understanding the mind, saying humans are motivated by their need to satisfy a series of hierarchical needs, starting with the most essential first. He thought it important for the advancement of psychology to identify, group, and rank them in terms of priority.

James E. Lovelock says the Earth (Gaia) is a superorganism, made up of all living things, interacting with the air, the oceans, and the surface rocks of the planet. He suggests Gaia takes an active role in keeping the planet safe for life, with automatic feedback mechanisms making adjustments as needed. Lovelock describes feedback mechanisms that are widely accepted. It is the implication that Gaia is somehow self-aware that is controversial.

Published in 1996, Arjun Appadurai's Modernity at Large is an edited collection of earlier essays that had already made the Indian-born anthropologist an influential figure in his field of cultural anthropology. Appadurai here presents a theory of globalization, and suggests ways that other researchers can follow up on his ideas. Many of them continue to do so. For anthropologists, the book offered new ways of thinking about how communities are affected by globalization.

In 2009's Liquidated, anthropologist Karen Z. Ho takes the tools of ethnographic research, which are traditionally used to study distant societies, and instead uses them to dissect the culture of high finance on New York's famous Wall Street. Through close observation of the daily lives of the bankers working there, and the beliefs, rituals, and timeframes that define them, Ho uncovers a distinct culture in which she finds the ultimate causes of the financial crises of recent times.

Geneva-born thinker Jean-Jacques Rousseau's famous work of political philosophy from 1762 is based on a give-and-take theory of the relation between individual freedom and social order: the social contract that gives the work its name. Rousseau thinks about the issue by starting with what is known as the state of nature, a lawless condition where people are free to do what they like, governed only by their own instinctive sense of justice. People are free, but they are also vulnerable to chaos.

The modern world has been marked by a series of immense social revolutions that have transformed the states where they happened. In 1979, American sociologist Theda Skocpol published States and Social Revolutions and examined three of these uprisings: in France at the end of the 18th century, then in Russia and in China in the first half of the 20th century. She pinpointed a number of common factors that affected each of these countries at the time revolution happened.

Reconstruction had the potential to make good on the promise of America's founders, bringing freedom and equality to all. Yet this promise was undermined by defiant Southern whites determined to protect their own privilege. Earlier interpretations of this period often blamed the failures of Reconstruction on black people. But Foner's analysis concluded that Reconstruction was an overall failure because whites prevented African Americans from becoming equal citizens.

In the 1960s, British historian Jonathan Riley-Smith first began studying the knightly orders of the Middle Ages that formed after the First Crusade. By the late 1970s, he had begun writing books from a "revisionist" point of view, challenging the common belief that the Crusades were motivated by fanaticism, and were designed to plunder the Holy Lands. To an extent, Riley-Smith's 1986 book The First Crusade and the Idea of Crusading overturned this previously held view.

The emergence of China as a major player on the international stage is one of the most significant developments in contemporary geopolitics - the study of the effects of geography (both human and physical) on international relations. Kang's call for understanding of and engagement with China, rather than containment and confrontation, makes China Rising a "must-listen" for anyone interested in international politics.

In his 2005 book Collapse: How Societies Choose to Fail or Succeed (also subtitled How Societies Choose to Fail or Survive), author and multifaceted US scholar Jared M. Diamond clearly identifies five major factors that he says determine the success or failure of all human societies in all periods of history. Having first asked why societies collapse, Diamond explores various examples of failed societies, from the Norsemen of Scandinavia, who colonized Greenland in the early 10th century, to the 18th-century inhabitants of Easter Island.

Born in 1933, Philip Zimbardo is a renowned and controversial American social psychologist who is fascinated by why people can sometimes behave in awful ways. Some psychologists believe people who commit cruelty are innately evil. Zimbardo disagrees. In his 2007 book, The Lucifer Effect, he argued that it is the power of situations around us that can cause otherwise good people to commit "evil", citing many historical examples to illustrate his point.

Philosopher Mary Wollstonecraft's 1792 work A Vindication of the Rights of Woman is a key text in the development of what we now know as feminism. Written in the atmosphere created by the French Revolution, which made radical change seem possible, Wollstonecraft's work challenges the idea that society's oppression of women is entirely natural. While her male contemporaries happily argued for the fundamental freedoms of all men, few were interested in extending these revolutionary rights to women.

Published in 1938, Cyril Lionel Robert (C. L. R.) James' The Black Jacobins is the little-known story of the only successful slave revolution known in history. It was this 12-year struggle of the African slaves in the French colony of San Domingo that led to the establishment of the Republic of Haiti in 1804. The uprising was inspired by the ideals of the French Revolution that had begun in 1789, just two years before, and in this work James goes to great lengths to show the relationship between the two upheavals.

In 1963's The Feminine Mystique, she identified "the problem that has no name" afflicting women pressured to devote themselves to domestic life. After World War II, society fostered the idea that women wanted different things from men - namely, to run homes and live through the achievements of their husbands and children. In reality, rigid gender roles left housewives frustrated and depressed and caused tensions both in their marriages and in how couples raised their children.

First published in Germany in 1980, British historian Ian Kershaw's The "Hitler Myth" is recognized as one of the most important books ever written about Adolf Hitler and the Nazi State. Kershaw wanted to focus on what he called the "history of everyday life", and so investigated the attitude of the German public to Hitler at the time, rather than looking at the dictator from the perspective of those in positions of power. He was intrigued to find out how someone like Hitler could have become such a powerful figure.

According to Aristotle, the ultimate human good is eudaimonia, an ancient Greek word that can be translated as happiness, or flourishing. Eudaimonia comes from a life of virtuous (or good) action. Virtues such as justice, restraint, and practical wisdom cannot simply be taught - they must be developed over time by cultivating virtuous habits. The making of virtuous choices can be developed by using practical wisdom and by recognizing the desirable middle ground between extremes of human behavior.