Opaque vs. Transparent Bidding Models

[tomslick]

Can someone point me towards research on the efficiency of Overture's vs. Google's bidding model for yield maximization?

I thought I saw a topic a few months ago but could not find it.

Thanks!

[tomslick]

I finally found it:

"Implementing Paid Placement in Web Search Engines:
Computational Evaluation of Alternate Mechanisms"

By Juan Feng and Hemant Bhargava, 2004/01

http://www.cba.ufl.edu/dis/papers/0413101.pdf