, ▁his ▁M . A . ▁in ▁econom ics ▁from ▁North western ▁University ▁in ▁ 1 9 7 6 , ▁and ▁his ▁Ph . D . ▁in ▁econom ics ▁from ▁North western ▁University ▁in ▁ 1 9 7 9 . ▁He ▁taught ▁at ▁Brown ▁University , ▁the ▁University ▁of ▁Southern ▁California , ▁and ▁the ▁California ▁Institute ▁of ▁Technology ▁before ▁returning ▁to ▁North western . ▁ ▁Academ ic ▁work ▁ ▁Sp ul ber ' s ▁research ▁is ▁in ▁the ▁areas ▁of ▁international ▁econom ics , ▁industrial ▁organization , ▁micro e conom ic ▁theory , ▁innov ation , ▁entrepr ene ur ship , ▁management ▁strategy , ▁and ▁law . ▁In ▁ 1 9 9 6 , ▁he ▁was ▁ranked ▁ 6 th ▁among ▁econom ists ▁in ▁the ▁United ▁States ▁and ▁also ▁highly ▁ranked ▁for ▁ 1 9 7 9 - 2 0 0 3 ▁adjust ed ▁appearances . ▁Sp ul ber ▁has ▁published ▁numerous ▁journal ▁articles ▁in ▁econom ics ▁journ als ▁and ▁law ▁reviews . ▁ ▁Selected ▁books ▁ ▁Books ▁written ▁▁▁ ▁Econom ics ▁and ▁Management ▁of ▁Compet itive ▁Str ategy , ▁ 2 0 0 9 , ▁New ▁Jersey : ▁World ▁Scient ific ▁Press ▁ ▁Network s ▁in ▁Tele communic ations : ▁Econom ics ▁and ▁Law , ▁with ▁Christopher ▁Y oo , ▁ 2 0 0 9 , ▁Cambridge : ▁Cambridge ▁University ▁Press ▁ ▁Global ▁Compet itive ▁Str ategy , ▁ 2 0 0 7 , ▁Cambridge : ▁Cambridge ▁University ▁Press ▁ ▁Management ▁Str ategy , ▁ 2 0 0 4 , ▁New ▁York