Reduction in price

[Helen]

Test No. errors/advan-5 "At the Airport", question 5

If you or a member of your family work for an airline, one of the great advantages is that you get a substantive reduction in the price of your air ticket.

(a) If
(b) advantages
(c) substantive
(d) price

Test No. errors/advan-5 "At the Airport", answer 5

If you or a member of your family work for an airline, one of the great advantages is that you get a substantial reduction in the price of your air ticket.

Correct entry: substantial
The error was: (c) substantive

You have found the error and your entry is correct.
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Preposition problem : can't one say "a reduction ON a price"?

[Alan]

My preference and instinct is for reduction in when we're talking about the actual figure/number as implied with price but reduction on when referring to the objects. So we could have: reductions in fares (railway ticket prices) but reductions on railway services, meaning there will not be so many trains available. Nevertheless, I think this is a very fine distinction and I prefer in.
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