Market Structure and Trading
Securities markets have two layers. In the primary market issuers sell new securities to raise capital, as in an initial public offering (IPO), and the proceeds go to the firm. In the secondary market existing securities change hands among investors, and the issuer receives nothing, yet this trading provides the liquidity that makes the primary market work. Trading happens on organised exchanges with a central order book, or over the counter (OTC) through a dealer network. Investors transmit instructions as orders. A market order executes immediately at the best available price, while a limit order sets a price and waits, trading off speed against price certainty.
Why it matters
Think of a new-car dealership versus the used-car market. The primary market is the dealership, where the manufacturer sells a brand-new vehicle and pockets the money to build more. The secondary market is everyone reselling those cars afterwards, where the maker earns nothing but a deep resale market is exactly what makes buyers willing to pay full price up front. Exchanges are like a central auction hall where all bids and offers meet in one visible book. OTC is a network of dealers you phone around, common for bonds. When you place an order, a market order says fill me now at whatever the price is, while a limit order says only at my price or better, even if I have to wait or miss out.
Worked examples
A company raises A$200 million by selling new shares in an IPO. A week later an investor sells some of those shares to another investor. Which transaction is primary and which is secondary, and who gets the cash each time?
The IPO is a primary-market transaction. The company issues new shares and receives the A$200 million to fund its operations. The later sale between investors is a secondary-market transaction. The shares simply change ownership, the seller receives the proceeds, and the company gets nothing. The secondary market’s role is to supply the liquidity that made investors willing to buy at the IPO.
A stock is quoted with a best ask of A$50.10. You want to buy but only at A$49.90 or lower. Which order type fits, and what is the trade-off versus a market order?
Place a limit order to buy at A$49.90. It will execute only if the price falls to A$49.90 or below, giving price certainty but no guarantee of execution. A market order would fill immediately near A$50.10, giving execution certainty but accepting whatever price the book offers. The choice is speed versus price control.
Common mistakes
- ✗The company receives money every time its shares are traded. The issuer is paid only in the primary market when securities are first sold. Secondary-market trades move money between investors, not to the firm.
- ✗Secondary-market trading is unproductive because no new capital is raised. Secondary trading supplies the liquidity and price discovery that make investors willing to buy in the primary market in the first place.
- ✗All securities trade on a central exchange. Many securities, especially bonds and some derivatives, trade over the counter through a dealer network rather than on a centralised exchange.
- ✗A market order guarantees a good price. A market order guarantees prompt execution but not the price, so in thin or volatile markets it can fill well away from the last quote.
Revision bullets
- •Primary market: issuers sell new securities and receive the proceeds
- •Secondary market: investors trade existing securities for liquidity
- •Exchanges use a central order book; OTC uses a dealer network
- •Market order: immediate execution at the best available price
- •Limit order: a set price that trades speed for price certainty
- •Secondary liquidity supports primary-market issuance
Quick check
When a company conducts an IPO, the proceeds from the newly issued shares go to
An investor who wants to buy only at A$49.90 or lower, even if the order may not fill, should use
Connected topics
Sources
- Brailsford, Heaney & Bilson (2015), Ch. 2Brailsford, T., Heaney, R., & Bilson, C. Investments: Concepts and Applications. 5th ed. Cengage Learning Australia, 2015.Explains primary versus secondary markets, exchange and OTC trading, order types, and the role of liquidity.
- Bodie, Kane & Marcus (2021), Ch. 3Bodie, Z., Kane, A., & Marcus, A. J. Investments. 12th ed. McGraw-Hill Education, 2021.Details how securities are issued and traded, market versus limit orders, and exchange versus OTC structures.