Average-case analyses of Vickrey costs

We explore the average-case "Vickrey" cost of structures in a random setting: the Vickrey cost of a shortest path in a complete graph or digraph with random edge weights; the Vickrey cost of a minimum spanning tree (MST) in a complete graph with random edge weights; and the Vickrey cost of a perfect matching in a complete bipartite graph with random edge weights. In each case, in the large-size limit, the Vickrey cost is precisely 2 times the (non-Vickrey) minimum cost, but this is the result of case-specic calculations, with no general reason found for it to be true. Separately, we consider the problem of sparsifying a complete graph with random edge weights so that all-pairs shortest paths are preserved approximately. The problem of sparsifying a given graph so that for every pair of vertices, the length of the shortest path in the sparsied graph is within some multiplicative factor and/or additive constant of the original distance has received substantial study in theoretical computer science. For the complete graph Kn with additive edge weights, we show that whp ( n lnn) edges are necessary and sucient for a spanning subgraph to give good all-pairs shortest paths approximations.