Brokers, Mutual Funds & Market Makers

• Explain that a broker executes your decision rather than making it.
• Describe how a mutual fund pools money for a fund manager to invest, while you choose the fund.
• Separate any market action into what you decided and what the participant carried out.

Say you want to buy a stock, invest without picking one yourself, or just place a trade and have it go through. Each of these needs a different helper. Each helper does exactly one job, nothing more.

Start with buying a stock you already chose. You cannot walk onto the exchange and shout an order yourself. A broker carries out that order for you. You say buy or sell, at what price, how many. The broker sends it into the market and gets it done. The broker never decides which stock. That choice is yours from start to finish.

None of these three roles replaces your own judgment, each one just does a specific, limited job.

Now say you do not want to research stocks every month. A mutual fund pools your money with many other people's money. A fund manager decides which stocks that pooled money buys and sells. You still decide which fund to use, how much to put in, and for how long. The fund manager only decides what happens inside the fund.

Underneath both of these sits a quieter job. For a trade to happen, someone has to be willing to take the other side right now. A market maker is a participant who keeps standing ready to buy or sell a given stock or contract. This is what lets trades in that stock happen smoothly, instead of buyers and sellers waiting around for each other.

Notice what all three have in common. You hand over only the part you cannot do yourself: placing the order, running daily research, standing ready every second. Every decision that actually matters stays in your own hands. Before you use any of these three, name in one sentence what that role is doing, and what you are still deciding.

A mutual fund's unit price is called its NAV (Net Asset Value): what the fund owns minus what it owes, divided by the number of units, worked out once at the end of each working day. An ETF (Exchange-Traded Fund) has an NAV too, but you do not buy or sell at it. Instead, ETF units trade all through the day on the exchange, through a broker, at whatever price buyers and sellers agree on right then, the same way an ordinary share does.

• Thinking the broker decides which stock you should buy. The broker app is the visible, official-feeling part of investing, so it feels like it must also be making the call. Fix: Remember the broker only carries out the order you already decided; the stock choice stays with you.
• Believing a mutual fund means you never have to think about money again. Since the fund manager picks stocks, it feels like all decisions have moved off your plate. Fix: Remember you still choose the fund, the amount, and how long to stay in it; the manager only picks the stocks inside it.

• A broker executes the buy or sell order you have already decided on, nothing more.
• A mutual fund pools money so a fund manager picks stocks, while you still choose the fund, amount and time.
• A market maker keeps quoting a price to buy and sell, which is what lets a trade happen smoothly.