Christopher Greenslate and Kerri Leonard, high school teachers outside San Diego, were griping about the rising cost of groceries when they decided to see what life is like for the billion people on earth who spend $1 a day on food. The couple's blog took off, and their book, On a Dollar a Day, hit stores in February. They're part of a growing population of consumers chronicling their efforts to do without, swearing off such things as riding in cars and buying clothes — or buying anything new at all. And they're not making these vows simply to save money. For...
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