Reciprocity & Risk

n add ei a ia i if di c e hi ic e fig 102 in

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Unformatted text preview: de e de ff i g, e c.) N add ei ( a ia i if di c e) hi ic e [Fig. 10.2 in Boone 1992, p. 307] A i e a he a ica a a i h ha if e' i c e a ia i i i ai i e he e a gi a a e i di i i hi g, i reduces i i fi e : a e f () a e f high ( ) a e age e ha a e f hei a e age (i.e., [V( ) + V( )]/2 < V[( + )/2]) [stud the graph carefull to understand this point -- it's not obvious!] B i he i a i i e e ed he a gi a a e i acce e a i g (i.e., he c e i be di g a d ): he a iab e c e ae e a ab e ha ab e e / a e ea , h fa - ee i g ch ice beha i (Thi i c e -i i i e, b ea ie g a if hi f ha a a i g e e be f 500 ca a da f a ee [= i e dea h] a ga b e i h e a cha ce e 1,000 ca /da ; c ea , he be cha ce f i i gi a e he ga b e! ) ig d efe : a f ge i g Ecological Conditions Favoring Dela ed Reciprocit S ha d e a Acc di g (i.e., a d f hi ha e d i h eci ci ? ec gica he , i e a : gi e di i i hi g fi e a d -be di g c e), i ( a ia i i c e) ca courses.washington.edu/anth457/reciproc.htm e a e eci f dc ci e i ada i e 3/8 1/15/12 Reciprocit & Risk To see why, consider a simple little scenario, involving a population of two individuals (I said "simple...
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