The Review of Economic Studies is one of the most highly respected academic journals in the field of economics. It is known for publishing leading research in all areas of economics, from microeconomics to macroeconomics. The journal is published by the Oxford University Press.
``A mild restriction on some but not all of the heterogeneity allows inference about a scalar parameter in research designs with a finite number of heterogeneous clusters where only a single cluster received treatment."
New accepted paper, from @hagmnn:
https://www.restud.com/inference-with-a-single-treated-cluster/