Who is a genius in Economics?

Question

That can solve this brain teaser of an equation?

QD = 20 – P

Prices are 8 and 12.

I want to see who knows economics out there. Cheers!

Answer 1

Ceteris paribus, you will be surprised to find out that this is not actually an econ question. This is however an econometrics question and econometrics is just modern applied mathematics and certainly not economics.

For a read in the history of real economic thought here's some great reading material:  

Human Action by Ludwig von Mises and

The Road to Serfdom by Frederich Hayek.

http://en.wikipedia.org/wiki/ Human_Action

http://en.wikipedia.org/wiki/ The_Road_to_Serfdom

This will put you on the road to Economic thought more than standard equations and regression models.

Answer 2

They seem to be reciprocal price points.

Answer 3

Milton Freeman.