population policy
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If we don't recognize that the unequal distribution of wealth is unsustainable, then, perhaps, says author David Rothkopf, more sinister political tensions and divisions will ensue. He advocates that the planet needs to reflect upon why we have one set of rules for our geographic community, and a different set of rules for institutions, among them the for-profit sector. Only when we hold the powerful players in economics responsible for co...more
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Variance of a population.
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The growth of populations is held in check by several factors. These can include predators, food and other resources, and density. Population density affects growth rate by determining how likely is it that an organism will interact with a member of its own species compared to an organism of a different species. Population growth studies rely on the mathematics of logs and exponents.
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In this lecture, bound and unbound orbits are discussed. Professor Lewin begins with a description of escape velocity, or the minimum speed required to escape the gravitational pull. Various sources of energy, energy storage, energy conversion, and the world's energy consumption are discussed. Power, or the rate at which a force does work on an object, is central to the conversation. Professor Lewin concludes with a few words on global ...more
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We apply the main idea from last time, iterative deletion of dominated strategies, to analyze an election where candidates can choose their policy positions. We then consider how good is this classic model as a description of the real political process, and how we might build on it to improve it. Toward the end of the class, we introduce a new idea to get us beyond iterative deletion. We think about our beliefs about what the other player ...more
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Professor Blight follows Robert E. Lee's army north into Maryland during the summer of 1862, an invasion that culminated in the Battle of Antietam, fought in September of 1862. In the wake of Antietam, Abraham Lincoln issued his preliminary Emancipation Proclamation, a document that changed the meaning of the war forever. Professor Blight suggests some of the ways in which Americans have attempted to come to grips with the enigmatic Lincol...more
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We apply the idea of evolutionary stability to consider the evolution of social conventions. Then we consider games that involve aggressive (Hawk) and passive (Dove) strategies, finding that sometimes, evolutionary populations are mixed. We discuss how such games can help us to predict how behavior might vary across settings. Finally, we consider a game in which there is no evolutionary stable population and discuss an example from nature.
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This lecture focuses on the process of emancipation after the passage of the Emancipation Proclamation on January 1, 1863. The Proclamation, Professor Blight suggests, had four immediate effects: it made the Union army an army of emancipation; it encouraged slaves to strike against slavery; it committed the US to a policy of emancipation in the eyes of Europe; and it allowed African Americans to enlist in the Union Army. In the end, ten pe...more
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We first complete our discussion of the candidate-voter model showing, in particular, that, in equilibrium, two candidates cannot be too far apart. Then we play and analyze Schelling's location game. We discuss how segregation can occur in society even if no one desires it. We also learn that seemingly irrelevant details of a model can matter. We consider randomizations first by a central authority (such as in a bussing policy), and then d...more
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By 1950, in most of the underdeveloped world, mortality had fallen to about half its pre-modern rate. The birth rate, however, had remained high and, by 1950, was about twice the death rate. For the rest of the century, both rates fell dramatically and in parallel, maintaining the gap. The enormous excess of births over deaths in this period is known as 'the population explosion.' By 1990, the world population was growing at almost 90 mill...more
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Census data is often politically influenced and hence inaccurate. The birthrate in developing countries is nearly twice that in developed countries. Most humans live in less developed countries, so the world birthrate is near the higher number. The world birthrate is two and a half times the death rate; we are not close to population stabilization. Almost everywhere, the death rate has been drastically reduced; further changes will not mas...more
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Prior to Malthus, population growth was seen as good for the power and wealth of a country. The rapid population growth of America was crucial in expelling England (via the Revolution) and France (via the Louisiana Purchase) from the US. But in fact, the numbers of the poor were growing in Europe in the 1700s. Malthus argued that poverty was due to an imbalance between people and resources; since population could rise very fast, it could a...more
