I took a microeconomics course and a macroeconomics course in college. Mergers/acquisitions may have been mentioned briefly, but they weren't a point of study. Microeconomics focused on why individual entities make decisions, and macroeconomics covered stuff like why we have currency, why is inflation useful and how the Fed manages it, etc.
In my decade on HN I've seen a lot about funding, IPOs, and acquisitions of private companies, but very little about hostile takeover of public companies.
Where are you expecting people to have developed an incidental background knowledge on deploying / overcoming poison pills?