Where a price comes from
Money market, capital market, primary and secondary market — and why a quoted price is a statement about the last trade, not about yours.
This lesson has had no expert review. It was written for this platform and against the evidence it cites; nobody has gone through it independently.
Learning objectives
- You can distinguish money and capital markets by maturity and recognize both in DeFi.
- You can say what a quoted price evidences and what it does not.
- You can name what makes a market liquid — and what merely makes it look so.
Check your prior knowledge
Answer these for yourself before reading on. Wherever you hesitate is where this lesson pays off.
- Where do you put money you need next week — and money that can sit for ten years?
- Where does the price a trading app shows you come from?
- What happens to the price when you trade ten times the usual size?
Core concept
Maturity separates money market from capital market
The money market lends short — days to months, to bridge gaps in the ability to pay. The capital market lends long, to finance something. Both exist in DeFi: a lending market whose deposit can be withdrawn at any time is in substance a money market, even where it quotes rates on an annual basis. A position with a lock-up is not.
The primary market creates, the secondary market reallocates
On the primary market something new comes into existence and capital flows to the issuer: an issuance, a deposit into a pool, the minting of new tokens. On the secondary market existing units change hands and the issuer receives nothing. The distinction matters for analysis because only primary events change supply — a secondary trade merely moves it.
A price is a statement about the last trade
The quoted price says: at this rate somebody last exchanged a certain quantity. It does not say you can trade at that rate, and certainly not in your size. The further your amount sits from the usual trade size, the less the quoted price has to do with yours — not because anyone treats you worse, but because the quantity available at that rate is limited.
Liquidity is the question of what trading costs
A market counts as liquid if a usual quantity can be traded quickly without moving the price much. Three things routinely diverge here: how much capital is deposited in total, how much of it stands ready near the current price, and how much actually trades per day. Only the last two say anything about what your trade will cost.
Definitions
- Money market
- Market for short-term lending of funds, typically over days to months.
- Primary market
- The event in which something new comes into existence and capital flows to the issuer.
- Market depth in the glossary
- The quantity tradable near the current price before the price moves noticeably.
Model
Which maturity? Money market or capital market
Primary or secondary — does the event change supply?
How much stands ready near the current price?
How much actually trades per day?
Worked example
The same rate, two amounts
- Quoted rate
- 1.0000
- Usual trade size
- USD 5,000
- Trade A
- USD 4,000
- Trade B
- USD 400,000
Trade A sits below the usual size and executes near 1.0000. Trade B is eighty times that; it works its way through the successive offers available and ends at a worse average rate.
Both see the same quoted rate; each pays a different one.
Reading: The quoted rate was wrong for neither of them — it simply was not a statement about B's outcome. Anyone trading a size that departs from the usual one needs depth, not the rate.
Retrieval
Exercise on real data
Read the guiding questions and sort which of them the deposited total answers and which it does not.
Dimension 6: liquidity →Application
Someone says: “The pool holds USD 40m, our 2m is no problem.” Which two questions do you ask back?
Related case studies
Institutional reading
- Bank
- Which of your on-chain positions are money market by maturity, and which capital market?
- Asset management
- Which price sits in your valuation — the last traded one or one adjusted for size?
Metrics in this lesson
Key takeaways
- Maturity separates money from capital markets, not the period a rate is quoted over.
- Only primary events change supply; secondary trading moves it.
- The quoted price applies to the last trade, not to yours.