Quote Originally Posted by ;
I believe there possibly another way to answer this query.
The problem is that like a currency pair, 1 half is expressed in terms of the other. Either side of the equation are both changeable and thus always changing.

Say x is oil, y is the dollar then at time t:
x=y t

If the supply/demand equilibrium of x varies so that provide grows 10% quicker than demand over a year, then when y stays constant:
1.1x y t 1 or x=y/1.1 Oil is currently about 10% cheaper
If we reverse the supply/demand equilibrium afterward:
0.9x=y t 1 or x=y/0.9 Oil is currently 10% dearer

What if...
I guess u must be a scholar in economics in your college, college times.