Peer ratings have become increasingly important sources of product information, particularly in markets for information goods. However, in spite of the increasing prevalence of this information, there are relatively few academic studies that analyze the impact of peer ratings on consumers...

The deployment of Next Generation Networks (NGNs) is attractive from both technical and social perspectives, but market forces may not suffice to trigger the desired levels of investment. Cave (2004) and the European Commission (2010) describe how National Regulatory Authorities (NRAs) have...

Recommender systems assign products to slots in ways that improve consumers' experience when choosing what to buy. They usually lead to more sales, which increases both consumer surplus and profit. However, firms may also choose which recommender system to use to maximize profit. Furthermore,...

Networks contain complex patterns of dependency and require multiple levels of analysis to explain their formation, structure, and outcomes. In this Element, the authors develop the Multilevel Network Framework. The framework serves as (i) a conceptual tool to think more deeply about network...