Who is always ready to trade with you?
A puzzle from Course 1: when you send a market order at 2:47 pm on a random Tuesday, somebody instantly takes the other side. Every time. Who volunteers for that job?
Meet the market maker
A market maker is a firm whose business is to quote BOTH a buy price (bid) and a sell price (ask) for a security, all session long — earning the spread between them as payment for standing ready. Buy from them at the ask, sell to them at the bid; do it thousands of times a second across thousands of securities, and pennies become a business.
This is the crowd's presence you measured in Course 1 when you compared spreads: tight spreads on big stocks exist because multiple market makers compete there; wide spreads on obscure ones reflect fewer willing dealers and higher risk of holding unwanted inventory.
Why exchanges want them
Without market makers, you'd wait for another regular investor to happen by with the opposite wish — minutes, hours, maybe days on quiet securities. With them, markets feel instant. Exchanges formalize the deal: designated market makers accept obligations (quote continuously, within maximum spreads) in exchange for privileges and fee incentives.
The speed layer
Modern market making is largely high-frequency: algorithms adjusting quotes in microseconds as information flows. This attracts controversy and headlines, but the daily reality for you is mundane — decimal pricing (US markets quoted in eighths of a dollar until 1997, then sixteenths, and only went fully decimal in April 2001!) and the machines' competition together compressed spreads to today's pennies. Your costs are lower because their race is expensive.
An honest boundary
Market makers aren't charities: they profit from flow, manage inventory ruthlessly and step back in storms (spreads widen exactly when markets panic — liquidity is fair-weather by nature). Knowing that prepares you for the one day in a hundred when the ocean isn't calm.
Try it now
- Here is a quote with both sides showing, for Apple and, on the second row, for Saga Communications, a company worth tens of millions of dollars: the bid and the ask, and how many shares wait at each. The gap between the two prices is the market makers' current charge for immediacy; the two sizes are how much they are willing to do it for.
- Compare the two rows: the spreads as a percentage of price, and the sizes. The difference is the market-making economics you have just learned, in two numbers. Five more companies of that small size are below, from a screen for market caps under half a billion dollars.
- Note the date and the two spreads somewhere you will find them again. The quote table refreshes every day, so on the next stressed day — you will know from the news — come back to this page and compare. Liquidity is fair-weather, and watching it thin out on a day that matters teaches more than any definition.
- One honesty check: that table is a delayed quote, roughly fifteen minutes behind for stocks. It is enough to see the shape of the spread and not enough to trade on, which is exactly the distinction this course keeps making.