This paper provides an update on the current state of in-house agencies. Whereas traditional consideration of internalizing advertising services was framed as a binary choice of build or buy, today's advertisers frequently pursue hybrid policies of build and buy to procure the customized bundle...

We assess substitutable and complementary relationships among eight national advertising media classes, as well as the magnitude of their own-price elasticities. We use a translog demand model, whose parameters we estimate by three-stage least squares, based on 1960-94 annual U.S. data.We find...