Adapted from Jason Zweig's new book, Your Money and Your Brain: How the New Science of Neuroeconomics Can Help Make You Rich, available from Simon & Schuster.
Last updated January 02 2008: 8:29 AM ET
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View Keep calm by using a spreadsheet that emphasizes your total net worth, not the changes in each holding. Before you buy a stock or mutual fund, check whether it overlaps what you already own - try the Instant X-Ray tool at Morningstar.com. Adapted from Jason Zweig's new book, Your Money and Your Brain: How the New Science of Neuroeconomics Can Help Make You Rich, available from Simon & Schuster. Last updated January 02 2008: 8:29 AM ET
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