Transformation of sentence

[Tan Elaine]

When there is a shortage of oil, its price will go up.

Sentence transformation of above question.

The price of oil will go up unless there is a shortage (of it).

If 'of it' necessary?

Thanks.

[Raymott]

When there is a shortage of oil, its price will go up.

Sentence transformation of above question.

The price of oil will go up unless there is a shortage (of it).

If 'of it' necessary?

Thanks.

No, "of it" would be understood.
I'm not sure what the exercise is, but your 'transformation' means the opposition of the original sentence.
A transformation that means the same is, "The price of oil goes up when there is a shortage [of oil/it]"
Your sentence means "When there is a shortage of oil, its price will not go up."

[Tan Elaine]

No, "of it" would be understood.
I'm not sure what the exercise is, but your 'transformation' means the opposition of the original sentence.
A transformation that means the same is, "The price of oil goes up when there is a shortage [of oil/it]"
Your sentence means "When there is a shortage of oil, its price will not go up."

Thanks, Raymott.

The answer is from an English workbook. Thanks for pointing out the error, which I failed to spot.