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English definition of “threshold effect”

threshold effect

noun [C]    
the fact of something reaching a level or point at which something starts to happen or change: We witnessed the threshold effect as renewable energy emerged from niche markets to compete for mainstream business.
MARKETING the fact that advertising for a product or service has to reach a certain level before sales increase: The threshold effect means that you have to see an ad 7 times for it to have an effect on you.
(Definition of threshold effect noun from the Cambridge Business English Dictionary © Cambridge University Press)
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