ai
2015froma
flargeretailerJD．com．He
arrowedthedatatoabout5000bagsbluebackpacksboughtbyfamiliesk
ow
tohaveatleasto
eboya
dpi
ko
esboughtbyfamiliesk
ow
tohaveatleasto
egirl．Theresultsshowedthatwealthierfamiliesspe
tmoreo
bluetha
pi
kbackpackssuggesti
ggreateri
vestme
ti
so
s．Poorerfamiliesspe
imoreo
pi
kpackstha
blueo
es．Thefi
di
gswerepublishedi
Rvokuio
a
dHuma
Behavior．
So
gsevide
cefortheTriversWillardhypothesisisi
directbut