Raise vs. increase

[Isabelle]

Test No. incompl/inter-36 "Go for it", question 9

If petrol prices ......... any more, I shall have to use a bicycle.

(a) ascend
(b) raise
(c) increase
(d) develop

Test No. incompl/inter-36 "Go for it", answer 9

If petrol prices increase any more, I shall have to use a bicycle.

Correct answer: (c) increase

Your answer was: incorrect
If petrol prices raise any more, I shall have to use a bicycle.
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Hi, why increase and not raise?

Isabelle

[Torsten]

You can raise money for a certain purpose, that means, you find the money.
Or you can raise the prices for something, that means, you increase the prices.

Raise is a transitive verb which requires an object.
Rise is an intransitive verb which doesn't require an object.

Examples:
We are going to raise the petrol prices. (we = subject, petrol prices = object)
The prices are rising. (prices = subject, no object)
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