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People often make decisions quickly when presented with a
choice. Are their initial answers a good approximation of what
they would choose if they took more time to decide? We explore
how individuals’ choices change with deliberation and find that
later choices systematically differ from early ones. We focus on
prosocial decisions and find that individuals’ choices respond
more to social efficiency as they deliberate over the course of
a minute. Our results call into question the use of revealed
preference for welfare when prosocial choices are made quickly
and provide guidance to policy makers and charities.
