⁠Greed Makes Markets: Market Making From First Principles With an HFT Quant

Market making serves a vital function in capitalist economies by providing liquidity and enabling price discovery through the systematic warehousing of risk. By operating within a central limit order book, market makers bridge the temporal gap between buyers and sellers, profiting from the spread between bids and offers. This strategy relies on quantitative models to estimate fair value, allowing firms to capture edge while maintaining risk-neutral portfolios. Competition among market makers compresses bid-offer spreads, reducing transaction costs and enhancing market efficiency. In thick, high-volume markets, liquidity is abundant and execution is precise, whereas thin markets suffer from price uncertainty and higher transaction costs. Ultimately, market makers act as essential intermediaries, transforming fragmented order flows into stable, efficient pricing mechanisms that benefit all market participants by ensuring that assets can be traded at any time.