  We must divide a finite number of indivisible goods and cash transfers
between agents with quasi-linear but otherwise arbitrary utilities over the
subsets of goods. We compare two division rules with cognitively feasible and
privacy preserving individual messages. In Sell&Buy agents bid for the role of
Seller or Buyer: with two agents the smallest bid defines the Seller who then
charges any a price constrained only by her winning bid. In Divide&Choose
agents bid for the role of Divider, then everyone bids on the shares of the
Divider's partition. S&B dominates D&C on two counts: its guaranteed utility in
the worst case rewards (resp. penalises) more subadditive (resp. superadditive)
utilities; playing safe is never ambiguous and is also better placed to collect
a larger share of the efficient surplus.
