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Think you’re rational? Better think twice!

Summary:
Think you’re rational? Better think twice! My friend Ben says that on the first day he got the following sequence of Heads and Tails when tossing a coin: H H H H H H H H H H And on the second day he says that he got the following sequence: H T T H H T T H T H Which day-report makes you suspicious? Most people I ask this question says the first day-report looks suspicious. But actually both days are equally probable! Every time you toss a (fair) coin there is the same probability (50 %) of getting H or T. Both days Ben makes equally many tosses and every sequence is equally probable! And in mainstream economics one of the basic assumptions is typically — still — that people make rational choices …

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Think you’re rational? Better think twice!

Think you’re rational? Better think twice!

My friend Ben says that on the first day he got the following sequence of Heads and Tails when tossing a coin:
H H H H H H H H H H

And on the second day he says that he got the following sequence:
H T T H H T T H T H

Which day-report makes you suspicious?

Most people I ask this question says the first day-report looks suspicious.

But actually both days are equally probable! Every time you toss a (fair) coin there is the same probability (50 %) of getting H or T. Both days Ben makes equally many tosses and every sequence is equally probable!

And in mainstream economics one of the basic assumptions is typically — still — that people make rational choices …

Lars Pålsson Syll
Professor at Malmö University. Primary research interest - the philosophy, history and methodology of economics.

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