Tài liệu Switch How to Change Things When Change Is Hard

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and others got a large bucket-the sort of huge tub that looks
like it might once have been an above-ground swimming pool.
Every person got a bucket so there'd be no need to share. The researchers
responsible for the study were interested in a simple
question: Would the people with bigger buckets eat more?
Both buckets were so big that none of the moviegoers could
finish their individual portions. So the actual research question
was a bit more specific: Would somebody with a larger inexhaustible
supply of popcorn eat more than someone with a
smaller inexhaustible supply?
The sneaky researchers weighed the buckets before and after
the movie, so they were able to measure precisely how much popcorn
each person ate. The results were stunning: People with the
large buckets ate 53 percent more popcorn than people with the
medium size. That's the equivalent of 1 73 more calories and approximately
21 extra hand-dips into the bucket.
Brian Wansink, the author of the study, runs the Food and
Brand Lab at Cornell University, and he described the results in
his book Mindless Eating: We've run other popcorn studies, and
the results were always the same, however we tweaked the details.
It didn't matter if our moviegoers were in Pennsylvania, Illinois,
or Iowa, and it didn't matter what kind of movie was showing; all
of our popcorn studies led to the same conclusion. People eat
more when you give them a bigger container. Period.
No other theory explains the behavior. These people weren't