Puzzles

The bat and the ball

A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost? Answer fast — then check yourself.

Reveal the answer

5 cents. Almost everyone's first instinct is 10 cents — but then the bat would be $1.10 and the total $1.20. This is the most famous item on the Cognitive Reflection Test: it measures whether you override your intuitive first answer.

— Shane Frederick, Cognitive Reflection and Decision Making — Journal of Economic Perspectives, 2005

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