A “pitch me a stock” question is not primarily a test of whether you can predict share prices. Interviewers want to see how you organize an investment argument, connect business performance to valuation, and acknowledge what could make you wrong. They also care about whether you can explain the idea without drowning them in facts.
Market questions test similar skills. You should know the major developments affecting equities, interest rates, credit, currencies, and announced transactions, but memorizing headlines is not enough. A strong answer explains why an event matters to companies, investors, or deal activity.