4 Days, 40 Hours is a book by Riva Poor reporting on a "revolution in work and leisure" from the rearranged work week. In some cases, the book shows, companies can increase production and profit while giving employees more time off.http://www.lib.niu.edu/1971/IP71078.html For example, Kyanize Paints would make 3 batches of paint on each of 5 work days, leaving the factory closed on weekends. Employees agreed to work 2 extra hours Monday through Thursday, in exchange for Friday off. The factory was then able to make 4 batches of paint on each of 4 work days. This increased production from 15 to 16 batches.

David Hamilton wrote, "Her research indicates that the shorter week is most successful in small, nondiversified industries." http://www.aliciapatterson.org/APF001972/Hamilton/Hamilton03/Hamilton03.html

• Economist Paul Samuelson
  Paul Samuelson
  Paul Anthony Samuelson was an American economist, and the first American to win the Nobel Memorial Prize in Economic Sciences. The Swedish Royal Academies stated, when awarding the prize, that he "has done more than any other contemporary economist to raise the level of scientific analysis in...
  
  , who has endorsed the idea of the four-day week
  Four-day week
  A four-day week is an arrangement where a workplace or school has its employees or students work or attend school over the course of four days rather than the more customary five. This arrangement can be a part of flexible working hours, and is sometimes used to cut costs.In 2008, employees of the...
  
  , suggests another possible result: a change in "the division of labor between husband and wife in the home to redress the ancient curse of female drudgery." Time Magazine - March 1, 1971