What Jane Street Actually Does -- Market Making, ETFs, and the Puzzle of Global Markets

Jane Street is one of the world's largest market makers, trading across 200+ electronic exchanges in 45+ countries. This module breaks down how Jane Street makes money, their dominance in ETF liquidity provision (41% of bond ETF trading volume), their expansion into equities, fixed income, and options, and why understanding their business model is essential for answering "Why Jane Street?" with real substance.