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roller coaster

 
 
noun [S]

Definition

a situation in which prices, rates, etc. keep going up and down by large amounts very quickly: Last week the roller coaster of crude oil prices climbed to $89.47 on Thursday and $90 on Friday. Mortgage chaos sent the stock market on a roller coaster ride.
(Definition of roller coaster noun from the Cambridge Business English Dictionary © Cambridge University Press)

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