Quick question.
A baseball and a bat cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?
Quick!
Answer!
You probably said $0.10 cents. And you're wrong. The correct answer is $0.05.
Don't feel bad if you got this wrong. Psychologist Daniel Kahneman says more than 50% of students at Harvard and MIT can't answer the bat-and-ball question correctly. I've heard it a dozen times and know the right answer, but I'm still tempted to blurt out "10 cents!" It just feels right. And what feels right is more common than what is right.
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