Which type of unemployment provides the biggest challenge for the economy and why?

 cyclical unemployment because it goes in cycles, and they are the reasons for the ups and downs in our economy.

United states v.  nixon, 418  u.s.  683 (1974),  was  a landmark  united states supreme court case  that resulted in a unanimous  decision  against president richard  nixon, ordering him to deliver tape recordings  and  other subpoenaed materials to a  federal  district  court.