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I am an economist, working mostly on competition policy (mergers and antitrust) and with amateur interests in maths and cognitive science. I know only the most basic definitions of Category Theory (e.g., I know what initial and terminal objects, functors and natural transformations are, but haven't quite got the hang of adjunction) and none of its applications, so I'll play the part of the absolute beginner in this course. Why am I here? Because I find Category Theory interesting in its own right (as a maths topic) and possibly useful for my hobbies; I doubt it will prove useful in my day job, even though I have seen (not understood!) some recent papers on categorical approaches to game theory, so who knows?