Good question! A think tank is an organization that researches and sometimes advocates for the government to do certain things. They can be a non profit or an llc (knuckleheads’ club is an llc right now because it was the easiest to set up). In theory, you can make money from founding a think tank, but in practice it’s not a lucrative endeavour unless it becomes big enough that the president start earning steady six figures (like at the major ones in dc).
