31 5 / 2012
The presence of litter leads people to litter more. ~ Cialdini, R.B., Raymond, R., & Kallgren, C.A. (1990). A focus theory of normative conduct: Recycling the concept of norms to reduce littering in public places. Journal of Personality and Social Psychology, 58(6), 1015-1026.
(via psychology2010)
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