I am presently a PhD Fellow in sociology at Sciences Po, Paris. I work on the conception of the market underlying processes of European financial market integration. Specifically, I study the integration of financial infrastructures in Europe since the introduction of the euro (payment and settlement systems, notably Target2 Securities). I aim to show how intrinsic problems to the underlying conception of the market structure problems and conflicts around integration projects and processes. Since these problems concern the limits of the market and the distinction between market and non-market, they become particularly visible in the domain of market infrastructures, particularly in times of development such as the present. The argument is developed in dialogue with political economy literature, but is based on discourse analysis and informed by the sociology of money literature.