00325pab a2200121 454500008004000000100001900040245006800059260000900127300001300136362000800149650001700157773002900174180718b2005   xxu||||| |||| 00| 0 eng d  aShimer, Robert  aThe cyclical behavior of equilibrium unemployment and vacancies  c2005  ap.25-49.  aMar  aUnemployment  aAmerican Economic Review