This question, perhaps, has two answers.

First is rather simple. Will it go down or will it go up - is like heads or tails, and u can just guess and believe in dat what you want.

Second is some deeper.

There are a lot of factors that affect any prices in the world. Studying these factors is a whole science.

However, somebody can simply believe in the theory of conspiracy and spend all his life looking for a source of insider information.

 May the Force be with you.