WASHINGTON — Harvard professor N. Gregory Mankiw is one of the most influential economists in the United States. But the 61-year-old’s authority does not stem from advancing an arcane scholarly ...

Samuelson Friedman: The Battle Over the Free Market, by Nicholas Wapshott (W. W. Norton, 385 pp., $28.95) Macroeconomics has come a long way in the last century. We’ve learned a lot about the forces ...