As a financial expert, could you estimate the cost savings in the U.S. alone through the country's use of daylight savings time?

Benjamin Franklin's estimates in 1784 yielded about $200 million in savings in today's dollars if people lived their days by making the best use of daylight.

David Prerau is the leading expert on daylight savings time, and his book, Seize the Daylight, explores not just the history of DST, but also the other two forms of artificial time--Greenwich Mean Time and the introduction of time zones.