7.1 Market Organization, Orders, and Trading
Key Takeaways
- Financial markets connect buyers and sellers, support price discovery, provide liquidity, and allocate capital.
- Primary markets raise new capital for issuers, while secondary markets transfer existing securities among investors.
- Order-driven, quote-driven, and brokered markets differ in how trading interest is displayed and matched.
- Market, limit, stop, and stop-limit orders trade off execution certainty, price certainty, and timing risk.
- Bid-ask spreads, depth, resilience, and immediacy are core dimensions of market quality.
Why market structure matters
Equity investing begins with market organization. A security can be valuable in theory, but investors also need a practical way to buy, sell, clear, and settle it. Markets reduce search costs, bring together trading interest, create transaction prices, and allow capital to move from savers to issuers.
The primary market is where issuers sell new securities and receive capital. An initial public offering, seasoned equity offering, rights offering, or private placement belongs here. The secondary market is where investors trade securities already issued. Secondary trading does not usually give cash to the issuer, but it supports liquidity and lowers the issuer's future cost of capital.
Participants and venues
Brokers act as agents for clients. They seek execution and earn commissions or fees. Dealers trade as principals from their own inventory. They quote bid prices at which they buy and ask prices at which they sell. The bid-ask spread compensates dealers for order processing, inventory risk, and adverse selection risk.
Exchanges are organized venues with listing rules, trading rules, and often centralized order books. Over-the-counter markets are networks where dealers and clients trade away from a centralized exchange. Electronic communication networks and alternative trading systems can match orders automatically.
Order-driven markets match public buy and sell orders using priority rules such as price and time. Quote-driven markets depend on dealers that post quotes. Brokered markets are useful for large, unique, or illiquid trades where a broker searches for a counterparty.
Order types
A market order seeks immediate execution at the best available price. It has high execution certainty but low price certainty. In a liquid stock the difference may be small. In a thin market, a market order can walk through the book and receive prices far from the last trade.
A limit order sets the worst acceptable price. A buy limit sets the highest price the trader will pay. A sell limit sets the lowest price the trader will accept. It improves price control but may never execute. A limit order can supply liquidity when it rests in the book.
A stop order becomes active when a stop price is reached. A sell stop can protect a long position after a price decline. A buy stop can protect a short position after a price rise. Once triggered, a stop order usually becomes a market order, so execution is likely but price is uncertain.
A stop-limit order becomes a limit order after the stop is triggered. It gives price protection after activation, but execution is no longer assured. This is a common exam trap. The trigger and the final execution price limit are separate ideas.
Market quality
| Dimension | Meaning | Strong market sign |
|---|---|---|
| Tightness | Low cost to trade immediately | Narrow bid-ask spread |
| Depth | Size available near current prices | Large quote size |
| Resilience | Speed of price recovery after trades | New orders arrive quickly |
| Transparency | Visibility of prices and orders | Reliable pre-trade and post-trade data |
Liquidity is not one thing. A market can have a narrow spread for small trades but poor depth for large trades. A market can show depth but lose it during stress. Candidates should read each question for the specific liquidity feature being tested.
Short sales, margin, and settlement
A long investor benefits when the share price rises. A short seller borrows shares, sells them, and hopes to buy them back at a lower price. Short selling can support price discovery, but it creates recall risk, short squeeze risk, dividend obligations, and theoretically unlimited loss potential.
Margin trading uses borrowed money or borrowed securities. Leverage magnifies gains and losses. Maintenance margin rules can force a trader to add capital or close a position after adverse price moves. Clearinghouses and settlement systems reduce counterparty risk by standardizing completion of trades.
Structured aid: order selection map
| Investor priority | Most likely order | Main risk |
|---|---|---|
| Immediate execution | Market order | Poor execution price |
| Minimum sale price or maximum buy price | Limit order | No execution |
| Exit after adverse price move | Stop order | Triggered market order price uncertainty |
| Exit with post-trigger price control | Stop-limit order | No execution after trigger |
Exam focus
When the stem says must trade now, think market order. When it says pay no more than or sell for at least, think limit order. When it says order activates only after a trigger price, think stop. When it says trigger plus price limit, think stop-limit.
Also separate broker and dealer roles. A broker represents the client. A dealer trades from inventory. A market maker is a dealer that stands ready to buy and sell. The most liquid market is usually tight, deep, resilient, and transparent, not merely active by share volume.
An investor wants to buy shares immediately and is willing to accept the best available price in the market. Which order is most appropriate?
A sell order that becomes a market order only after the stock trades at or below a specified trigger price is best described as a:
In an equity trade, a dealer most likely: