Merge pull request #325 from devangt/patch-1

Update README.md

economics/README.md

@@ -3,3 +3,5 @@
 ## Auctions and Bidding
 
 * [Auctions and bidding: A guide for computer scientists](http://www.sci.brooklyn.cuny.edu/~parsons/projects/mech-design/publications/bluffers-final.pdf) by Simon Parsons
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+* [Optimal Bidding in Online Auctions] (http://www.mit.edu/~dbertsim/papers/Revenue%20Management/Optimal%20Bidding%20in%20Online%20Auctions.pdf) by Dimitris Bertsimas, Jerey Hawkinsy, Georgia Perakis