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...

What accounts for the diversity and limited concentration that has long characterized the organization of the advertising agency industry? This question is addressed by treating an advertising agency as a multiproduct firm. The firm's product line or service mix is defined in terms of the set of...

How important are economies of scale and scope in advertising agency operations? This paper reports an econometric study undertaken to address this question. Cost models are formulated which represent how the principal component of agency costs, employment level, varies according to the mix of...