Approximation Algorithms for CAs with Complement-Free Bidders. e/(e-1)-e (NP), 4/3-e ... Proof sketch: We will illustrate the proof by giving an example of how ...
... Sn such that social welfare Svi(Si) is maximized. ... The expected value of vi(Si) is SSxi,Svi(S) ... There is an allocation in which v'i(Si)=2, for all i. ...