Who you trade with

Every share you buy was sold to you by someone. Every share you sell is bought by someone. It is easy to picture that someone as another small investor much like you, sitting at another kitchen table. Sometimes it is. Often it is not. A large part of the market is professional, and knowing who you share it with is the difference between trading with false confidence and trading with clear eyes.

Three kinds of participant

Retail investors are individuals investing their own money, usually in modest amounts. There are millions of them, and you are one. Retail money is small per person but large in total, and it is the group most likely to act on emotion, news, and tips.

Institutional investors are large organisations that invest enormous pools of money on behalf of others: mutual funds, insurance companies, pension funds, banks, and the big foreign and domestic investment institutions you hear about on the news. They employ full-time analysts, trade in very large sizes, and because of that size their buying and selling can move a stock's price on its own. They are professionals, at it all day, every day.

Market makers and proprietary trading firms are a quieter presence. A market maker continuously offers both a price to buy and a price to sell a stock, earning the small spread between them and keeping the market liquid for everyone else. Many of these firms trade with fast computers and hold positions for seconds or minutes. You will meet this world properly in the algorithmic-trading material later, but know now that a good share of the activity around your order is automated.

Why this matters for you

Put these together and a plain truth follows. When you place an order, the party on the other side may well be a fund manager or an automated system with more information, better tools, and far more time than you. This is not a reason for fear. It is a reason for humility. You are unlikely to beat professionals at their own short-term game of reacting fastest to news and prices.

The encouraging part is that you do not have to play that game. The retail investor has one real and durable edge, and it is not speed or information. It is time, and the freedom to wait. A fund manager is judged every few months and cannot simply sit still for a decade. You can. This is exactly why the patient, long-horizon investing of the first two chapters is the sane path for almost every beginner. You are not trying to out-trade the computers. You are owning good businesses and letting compounding do the work. The professionals' presence even helps you, by keeping the market liquid and its prices fair.

What to carry forward

You share the market with three broad groups: retail investors like yourself, large institutions running professional money, and market makers who quote both sides and keep trading liquid. Because so much of the crowd is professional, trying to win at fast, reactive trading is a hard road for a beginner. The honest and encouraging conclusion is that you do not need to. Your durable advantage is time and patience, the very thing the first chapters were built on.

One last piece of the machinery remains before you can read the market itself. When your order matches a professional's on the other side, how does the swap of shares for money actually complete, and safely? That is the next chapter.