How much money does Daylight Saving Time cost the U.S. economy in lost productivity?

According to a study by research firm Chmura Economics and Analytics, the changing of the clocks cost the U.S. economy $433,982,548 in 2010. Researchers identified trends in health risks, like heart attack, that coincide with the time change, along with a tendency of workers to surf the Web aimlessly after the change. 

“The markets that see the largest per capita economic loss in this index are heavily concentrated in West Virginia and Florida where it appears higher heart attack rates and the impacts of workplace injury due to mining and construction are most acute," said Chris Chmura, president and chief economist for Chmura Economics & Analytics.

Hawaii and most parts of Arizona are the only states that do not observe Daylight Saving Time.