It is well-known that optimal (i.e., revenue-maximizing) selling mechanisms in multidimensional type spaces may involve randomization. We obtain conditions under which deterministic are for two identical, indivisible objects to a single buyer. analyze settings: (i) decreasing marginal values (DMV) and (ii) increasing (IMV). Thus, the of buyer units not independent. show condition on distributio...

Differences in drawing development are conditioned by genetics, environment and individuality of children. Therefore, it is exciting to observe the children, who raised same have a similar genetic basis, that twins, triplets, so forth. In study, we were interested similarities differences two which identical twins (B1 B2) one was non-identical (A), whether characteristics appear more congruentl...