The following triple of problems illustrates
the framing of contingencies. Each
problem was presented to a different
group of respondents. Each group was
told that one participant in ten, preselected
at random, would actually be
playing for money. Chance events were
realized, in the respondents' presence,
by drawing a single ball from a bag containing
a known proportion of balls of the
winning color, and the winners were paid
immediately.