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Could you ask him to call me? essay about online classes Hansen's work provided a way to measure how variables interact without presuming a perfect knowledge of how risky they are. His methods have been used in finance and macroeconomics. As the last five years have shown, financial risk has profound effects on the real economy. But how and through what channels is not well understood; macroeconomists often make unrealistic assumptions about risk or ignore it altogether. But even though Hansen pioneered new ways of using data to understand macro models of the economy and finance, he stresses we should not overestimate what we know.