What are two factors causing decrease in the supply of petrol? What two factors have lead to the decrease in the supply of petrol?

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The second answer is much better than the first if you are asking this for an Economics class.

Two things I'd like to add:

1. At least in American terminology (I've never looked at a textbook from any other country, unfortunately) demand can NOT affect supply.  A change in supply...

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The second answer is much better than the first if you are asking this for an Economics class.

Two things I'd like to add:

1. At least in American terminology (I've never looked at a textbook from any other country, unfortunately) demand can NOT affect supply.  A change in supply is shown by movement of the supply curve on a graph and a change in demand does not change the supply curve.

2. However, one factor that affects supply is the expectations of producers.  If the oil companies believe that demand will stay low (and prices will also stay low), they will not invest so much in finding new sources of crude oil.  This will increase, as the second answer points out, the price of producing petrol

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There are many factors. Some of these are:
1.There are many concerns about the Middle East: is it stable enough politically to assume that petro will be supplied regularly.

2.The Russians are cutting the supply of oil, to hurt the US economy, and at the same time helping their economy by keeping their own oil

3.There is competition from the Chinese, Indian, Japanese, Korean, and Brazilians since they are needing more petro.  They're making big deals with Venezuela and Sudan to get a bigger piece of the petro for themsleves.

4.The big oil companies are having problems uncovering more fields.

5. Companies are having problems getting money to fund looking for more oil. For example Cheetah Oil recently stated to Reuters that their funding sources are making it difficult for them to go ahead with their search for more oil reserves.

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