<P> Several studies have suggested that DST increases motor fuel consumption . The 2008 DOE report found no significant increase in motor gasoline consumption due to the 2007 United States extension of DST . </P> <P> The undisputed winners of DST are the retailers, sporting goods makers, and other businesses that benefit from extra afternoon sunlight . Having more hours of sunlight in between the end of the typical workday and bedtime induces customers to shop and to participate in outdoor afternoon sports . People are more likely to stop by a store on their way home from work if the sun is still up . In 1984, Fortune magazine estimated that a seven - week extension of DST would yield an additional $30 million for 7 - Eleven stores, and the National Golf Foundation estimated the extension would increase golf industry revenues $200 million to $300 million . A 1999 study estimated that DST increases the revenue of the European Union's leisure sector by about 3% . </P> <P> Conversely, DST can harm some farmers, young children, who have difficulty getting enough sleep at night when the evenings are bright, and others whose hours are set by the sun . One reason why farmers oppose DST is that grain is best harvested after dew evaporates, so when field hands arrive and leave earlier in summer, their labor is less valuable . Dairy farmers are another group who complain of the change . Their cows are sensitive to the timing of milking, so delivering milk earlier disrupts their systems . Today some farmers' groups are in favor of DST . </P> <P> DST also hurts prime - time television broadcast ratings, drive - ins and other theaters . </P>

Why do clocks not keep correct time in summer and winter