I’ve just heard a wonderful phrase, new to me: “the rocket and feather effect”.
It means up like a rocket and down like a feather.
It was used to describe the movement of petrol prices: up like a rocket when crude oil prices go up and down like a feather when they does down.
You can see it
This is a great use of language: we can see it going up and down at different speeds.
I heard it on the World at One on BBC Radio 4.
Apparently the “official” term is “asymmetric price transmission”.
What else could it be applied to? The effect of central bank interest rate changes on mortgages, for one. How could you apply it?
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