Wagner's MBA Law of Littering

Wagner's MBA Law of Littering: Litter begats litter. Once people see litter, they tend to litter more than they would otherwise litter. Pick up litter as soon as you see it. Visible litter creates a social context that presumes acceptability of littering. A randomly selected individual's attitude toward littering is unfavorable in the absence of visible litter, but grows as the littered area grows, ceteris paribus.