A Logical Characterization of Constraint-Based Causal Discovery

We present a novel approach to constraint-based causal discovery, that takes the form of straightforward logical inference, applied to a list of simple, logical statements about causal relations that are derived directly from observed (in)dependencies. It is both sound and complete, in the sense that all invariant features of the corresponding partial ancestral graph (PAG) are identified, even in the presence of latent variables and selection bias. The approach shows that every identifiable causal relation corresponds to one of just two fundamental forms. More importantly, as the basic building blocks of the method do not rely on the detailed (graphical) structure of the corresponding PAG, it opens up a range of new opportunities, including more robust inference, detailed accountability, and application to large models

If you won't pay them, buy them: Merger mania in distribution and content markets

Structural changes in TV markets are resulting in carriage disputes that have spread from the United States to Europe. A carriage dispute refers to a disagreement between a pay-TV operator and a broadcaster over the right to ‘carry’ a broadcaster’s channel. TV broadcasters are demanding ever increasing payments from pay-TV operators that complain about lower-profit margins due to spiralling programming costs. This article discusses vertical mergers between distributors and broadcasters as a possible way to reduce retransmission payments and to secure cheap and privileged access to programming in today’s hypercompetitive video markets