Further to Vedder's review of Perelman, I regret, of course, that Perelman, whom I intended to support, takes issue with me. Since he does not explicitly say why, I am at a loss. However, the current issue of David Warsh's excellent blog, <economicprincipals.com>, reviews some recent history of the controversy over whether telecasting and related communication industries are public goods. He makes the point, as did Samuelson and others, that here is a case where variable costs are very low relative to fixed costs, so marginal-cost pricing is in order. Professor Vedder's generalization that the case of MC<AC ended with the railroad era might be questioned. Plus, of course, the r.r. era has not entirely ended anyway, and its decline in intra-urban transit has been hastened by the loss of understanding of the principles of marginal-cost pricing. Mason Gaffney