That is a new NBER paper by Ran Abramitzky, the abstract is here:
I reflect on the role of modern economic history in economics. I document a substantial increase in the percentage of papers devoted to economic history in the top-5 economic journals over the last few decades. I discuss how the study of the past has contributed to economics by providing ground to test economic theory, improve economic policy, understand economic mechanisms, and answer big economic questions. Recent graduates in economic history appear to have roughly similar prospects to those of other economists in the economics job market. I speculate how the increase in availability of high quality micro level historical data, the decline in costs of digitizing data, and the use of computationally intensive methods to convert large-scale qualitative information into quantitative data might transform economic history in the future.
I have for a while been pleased that GMU has one of the largest collections of economic historians (I would say four,) of any department around, UC Davis being another major presence in that area.