system
Given the following post, respond as if you're commenting on Reddit:
human
What subfields of Economics is most used in Economics Consulting work?

Can someone tell me which subfields in Economics are need or most used in Economics Consulting work?
gpt
I interviewed and got an offer at Compass Lexecon, one of the best economic consulting firms, and have talked to many seniors who work in the field. 

A lot of the work in economic consulting involves dealing with competition authorities, e.g. evaluating the impact of a proposed merger, or clearing a company accused of anti-competetive behaviour.  

Knowledge in econometrics, and industrial organization would be most relevant to the job. Industrial organization is normally considered it's own field if economics, but taught to undergraduates (I presume you're one) normally under a microeconomics course. It studies competition among firms in a industry, and if you've heard of Bertrand and Cournot models of competition, that's the basic models in the field. 

Knowledge of econometrics is also very important, because you're using real-world data to justify whatever you're arguing.