The conjunction fallacy explains why fake news is believable.

# Fake News Capitalizes on the Conjunction Fallacy to Make Stories Seem Believable

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Dec. 19 2016 10:46 AM

# The Conjunction Fallacy Explains Why People Believe Fake News

## This fallacy warns that stories with more facts sound more believable, even though they’re actually less probable.

Imagine there are 100 toy blocks in front of a toddler. Each of the blocks costs \$1, 50 of them are red, 50 blue, and to build a sturdy little house requires about 75 or so blocks. By necessity the house will contain blocks of both colors—even if the child is partial to one of the colors.

Now imagine a new manufacturing technology comes along and makes it possible to make these blocks for 1 cent each. Parents can now buy sets of 10,000 blocks, 5,000 red ones and 5,000 blue ones for the same amount of money. The toddler again makes his or her house, but if partial to one of the colors, he or she can easily find 75 blocks of the same color and make an all red house, or an all blue house, or a monstrosity of a mansion.