We examine situations in which a party must make a sunk investment prior to contracting with a second party to purchase an essential complementary input. We study how the resulting hold-up problem is affected by the seller's information about the investing party's likely returns from its...

We examine the pricing implications of call externalities, the benefits enjoyed by the recipient of a message sent by another user. We show that, with or without a network-profitability constraint, efficient pricing requires consideration of demands, as well as costs. We present conditions under...