Why does the Brexit cause a fall in crude oil prices?
Uncertainty has very far reaching effects.   Oil is up ~100% since February and down ~40% from it's 52 week high (and down even more on a longer timeline).  It's not exactly a stable investment vehicle and moves a few percent each day on basically nothing.  A lot of securities will be bouncing around for the next couple weeks at least while folks remain uncertain about what the "brexit" will actually mean.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Why does the Brexit cause a fall in crude oil prices?

### Response:
Uncertainty has very far reaching effects.   Oil is up ~100% since February and down ~40% from it's 52 week high (and down even more on a longer timeline).  It's not exactly a stable investment vehicle and moves a few percent each day on basically nothing.  A lot of securities will be bouncing around for the next couple weeks at least while folks remain uncertain about what the "brexit" will actually mean.