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Yelp ratings get better when they cost something — like time, say Princeton researchers
www.princeton.edu
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free online ratings are less trustworthy than those that have some cost to them... In ecology, costly signaling theory argues that displays that “cost” more — like elaborate peacock tails, or strenuous displays of hunger from baby birds — are more likely to reflect reality... making rating goods or services as easy as possible... is counterproduct…

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