▁An war ▁El ▁Sad at ' s ▁ 1 9 7 7 ▁visit ▁to ▁Israel ▁during ▁a ▁prolong ed ▁period ▁of ▁host ilities ▁between ▁the ▁two ▁countries ▁was ▁well - rece ived ▁and ▁ultimately ▁contributed ▁in ▁the ▁Egypt – Is rael ▁Peace ▁Tre aty . ▁ ▁The ories ▁ ▁Game ▁theory ▁ ▁Social ▁d ile mm as ▁have ▁attract ed ▁a ▁great ▁deal ▁of ▁interest ▁in ▁the ▁social ▁and ▁behavior al ▁sciences . ▁Econom ists , ▁bi olog ists , ▁psych olog ists , ▁soci olog ists , ▁and ▁political ▁scient ists ▁al ike ▁study ▁behavior ▁in ▁social ▁d ile mm as . ▁The ▁most ▁influ ential ▁theoretical ▁approach ▁is ▁economic ▁game ▁theory ▁( i . e ., ▁rational ▁choice ▁theory , ▁expected ▁utility ▁theory ). ▁Game ▁theory ▁assumes ▁that ▁individuals ▁are ▁rational ▁actors ▁motiv ated ▁to ▁maxim ize ▁their ▁util ities . ▁Util ity ▁is ▁often ▁narrow ly ▁defined ▁in ▁terms ▁of ▁people ' s ▁economic ▁self - inter est . ▁Game ▁theory ▁thus ▁predict s ▁a ▁non - co oper ative ▁outcome ▁in ▁a ▁social ▁d ile m ma . ▁Although ▁this ▁is ▁a ▁useful ▁starting ▁prem ise ▁there ▁are ▁many ▁circumstances ▁in ▁which ▁people ▁may ▁devi ate ▁from ▁individual ▁rational ity , ▁demonstr ating ▁the ▁limitations ▁of ▁economic ▁game ▁theory . ▁ ▁E volution ary ▁theories ▁ ▁Bi ological ▁and ▁evolution ary ▁approaches ▁provide ▁useful ▁complement ary ▁ins ights ▁into ▁decision - making ▁in ▁social ▁d ile mm as . ▁According ▁to ▁self ish ▁gene ▁theory , ▁individuals ▁may ▁purs