a sunk cost 

month
2012 2013
  • January 17
  • February
  • March
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  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December
2012 2013
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August 79
  • September 15
  • October 30
  • November 42
  • December 15