**Other Fields Show Rising Interest in Economics Research** Other disciplines increasingly cite economics, and vice versa. This development parallels a rise in the importance of empirical work in economics. Economics is sometimes described as an isolated field that interacts little with other academic disciplines. In **Inside Job or Deep Impact? Using Extramural Citations to Assess Economic Scholarship** (NBER Working Paper No. 23698), Joshua Angrist, Pierre Azoulay, Glenn Ellison, Ryan Hill, and Susan Feng Lu ask whether this perception is accurate, and how the reality of economics' interdisciplinary interactions has evolved.  To measure the conversation between economics and other disciplines, the research team used "extramural" citations as a yardstick: how often papers in the journals of one discipline (such as the _American Economic Review_) were cited in the journals of another (such as the _American Sociological Review_). They used the Web of Science database, which records most academic journal citations, and studied the period 19702015. Their analysis considers only disciplines that rely on academic journals to disseminate scholarship.  
  
Disciplines covered include social sciences (political science, sociology, anthropology, and psychology, as well as economics); business fields (finance, accounting, marketing, and management); mathematics-related fields (operations research, statistics, computer science, and mathematics); and a group of "other sciences" (multidisciplinary science, public health, medicine, and physics).  
  
Economics indeed cited other disciplines little in the 1970s and 1980s. But this changed starting around 1990: Economics has since been citing other social sciences more than psychology, and cites many non-social-science disciplines as much as or more than other social sciences do.   
  
Economics is the most influential social science in seven of the 16 disciplines the researchers examined, and recently tied for first in two more. Sociology and psychology also have substantial extramural influence. Economics' extramural influence is growing in many disciplines; only in business disciplines has economics' influence recently faded.   
  
No single field within economics is responsible for its greater extramural presence. Indeed, economics' extramural influence is boosted by the fact that different disciplines find something useful in different parts of the field.   
  
The growing extramural impact of economics research parallels an important change in the nature of economics research. In the 1970s, economics research was more theoretical than it is today, and theoretical papers were cited far more than empirical ones. Since the 1990s, this has reversed: economics research is much more empirical and empirical economics research is now cited more often than other sorts of research.  
  
For example, in the 1970s and 1980s, only one of the top 10 most cited economics papers was empirical, while, by the 2000s, six out of 10 were. The researchers hypothesize that empirical economics research has grown in quality as well as quantity. At the same time, they note that some disciplines in which the influence of economics scholarship is growing, most notably computer science and operations research, have been and remain focused on economic theory.   
---