Harbir Singh of the Wharton School says Aramark's second move to privatization is part of a growing trend.<br><br><a href='http://www.baltimoresun.com/business/bal-bz.aramark21dec21,0,4459902.story?coll=bal-pe-business' target='_blank'>http://www.baltimoresun.com/business/bal-bz.aramark21dec21,0,4459902.story?coll=bal-pe-business</a><br><br>