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After the age of 40, we may notice occasional lapses--a forgotten phone number, a friend's name, or a word that was right on the tip of our tongue. By 60, we may find ourselves wondering who called this morning, why we came into the kitchen, where we parked the car. In an aging nation, where one citizen in seven will be 65 when the next century arrives, these little difficulties raise a larger question: What precisely happens to our thinking as we grow older? What is normal, what is not, and how are we to know the signs?

Douglas Powell offers a comprehensive account of cognitive...

The Nature of the Farm is a theoretical and empirical study of contracts and organization in agriculture based on the transaction cost framework. Transaction costs are important in agriculture because nature (for example, seasonality, weather, pests) plays such a critical role in determining output and limiting the ability of farmers to specialize. The book develops specific models and tests the implications of those models against data sets from across North American agriculture, as well as against historical case studies such as eighteenth-century European land contracts and the...