First of all, there are far too many examples to list whether they are in Economics or elsewhere but I am glad you highlighted some of them.
Unfortunately posting styles and patterns cannot always be an indicator of alt-accounts or farmed accounts because some of the puppeteers employ different tactics in an effort to misdirect but more often than not there are tell-tale signs. What some of them fail to understand is that the more they type and over-quote, they shine a light on to themselves.
I see them in the Economics section and both by the way they write and by their nickname it seems to me that they are alts. They look like they have a lot of time to write nonsense from their mom's basement while eating Doritos and drinking Monster. Sorry for the overquotes but I think this way it will be clear: