Market Orders vs. Limit Orders: Who Takes Liquidity and Who Provides It?

What is an order?

An order is an instruction to buy or sell an asset under specified conditions. When an order reaches an exchange, the matching engine compares it with orders already available in the order book.

The order book has two sides:

• Bids: orders offering to buy.
• Asks: orders offering to sell.

The highest available bid is the best bid. The lowest available ask is the best ask. The space between them is the bid-ask spread.

Imagine a simplified Bitcoin order book:

The best bid is 60,000 and the best ask is 60,001. The displayed spread is therefore 1. No transaction occurs merely because these prices are visible. A trade occurs when an incoming order can match an existing order.

What is a market order?

A market order instructs the venue to buy or sell at the best available prices. A market buy matches available sell orders, beginning at the best ask. A market sell matches available buy orders, beginning at the best bid.

The central priority is execution speed, not an exact execution price.

Using the example above, a market buy for 0.3 BTC could execute entirely against the 0.5 BTC offered at 60,001. If the market buy were for 1 BTC, it would consume the 0.5 BTC at 60,001 and then continue into the next available ask.

The order might fill as follows:

• 0.5 BTC at 60,001
• 0.5 BTC at 60,002

The average execution price would be higher than the best ask visible when the order was submitted. This difference between the expected price and the realized execution is commonly described as slippage.

Market orders generally provide greater execution certainty than limit orders, but they do not guarantee a particular price. The last traded price or visible best quote may differ from the price ultimately received, especially when prices change rapidly or available depth is limited.

What is a limit order?

A limit order specifies the least favorable price at which an order may execute. A buy limit can execute only at its limit price or lower. A sell limit can execute only at its limit price or higher.

Suppose Bitcoin still has a best bid of 60,000 and a best ask of 60,001:

• A buy limit at 59,999 may rest below the market.
• A buy limit at 60,000 may join the current best bid.
• A buy limit at 60,001 can match the current best ask immediately.

All three are limit orders, but they do not interact with liquidity in the same way.

The first two can add buying interest to the book because they do not cross the spread. The third can execute immediately against an existing sell order. It controls the maximum purchase price, but it still removes available liquidity.

A limit order therefore provides price control, not execution certainty. If the market never reaches the specified price—or if other orders have priority—the order may remain partially filled or may not fill at all.

Who makes liquidity?

An order provides liquidity when it rests in the order book and becomes available for another order to trade against. The resting order is often called a maker order because it adds an executable quote to the market.

Examples include:

• A buy limit resting at or below the best bid.
• A sell limit resting at or above the best ask.
• A post-only order accepted by the venue and placed in the book.

A resting order expresses willingness to transact at a particular price, but it does not represent completed volume. It may later execute, remain open, change or be cancelled.

“Liquidity provider” also describes the order’s role, not necessarily the identity of the participant. The maker could be an individual, a trading firm, an automated system or a professional market maker.

Who takes liquidity?

An order takes liquidity when it executes against an order already resting in the book. The incoming order is called a taker order because it removes some or all of the available quantity at one or more prices.

Market orders are normally taker orders. However, marketable limit orders can also take liquidity.

For example, if the best ask is 60,001:

• A market buy will trade against available asks.
• A buy limit at 60,001 can trade against the best ask.
• A buy limit at 60,005 can trade against asks up to 60,005 if sufficient quantity is requested.

Coinbase’s trading rules explicitly state that a limit order may become a maker order, a taker order, or partially both. A post-only instruction is designed to prevent the order from taking liquidity.

This is why the common shortcut, “market orders take and limit orders make”, is useful for an introduction but not universally correct.

Market vs. limit orders

Neither order type is inherently better. They solve different execution problems. A participant choosing a market order accepts price uncertainty in exchange for immediacy, while a participant choosing a non-marketable limit order accepts execution uncertainty in exchange for price control.

Aggressive vs. passive flow

Order-flow analysis often describes takers as aggressive participants and makers as passive participants.

An aggressive buyer accepts available ask prices. An aggressive seller accepts available bid prices. Passive buyers wait with bids, while passive sellers wait with asks.

The words aggressive and passive describe how orders interact with the book. They do not describe a participant’s personality, confidence, sophistication or longer-term market view.

An aggressive buyer could be opening a position, closing a short, reducing a hedge or completing an arbitrage. A passive seller could likewise be opening, closing, hedging or managing inventory. Executed order-flow data shows what happened at the matching engine, not why a participant acted.

Every trade has two sides

A trade cannot occur without both a buyer and a seller. If 1 BTC changes hands, 1 BTC was bought and 1 BTC was sold.

That makes statements such as “there were more buyers than sellers” imprecise when discussing executed volume. The quantities bought and sold are equal by definition.

The more useful question is:

Which side crossed the spread and initiated the transaction?

If an incoming buyer trades against a resting sell order, the transaction is buyer-initiated. If an incoming seller trades against a resting buy order, it is seller-initiated.

This aggressor classification is the conceptual basis for volume delta.

How orders become delta

Volume delta compares buyer-initiated and seller-initiated executed volume over a selected interval:

Volume Delta=Buyer-Initiated Volume−Seller-Initiated Volume

Suppose a one-minute interval contains:

• 120 BTC of buyer-initiated volume
• 80 BTC of seller-initiated volume

The interval delta is positive 40 BTC. This means buyers initiated 40 BTC more executed volume than sellers during that interval.

It does not mean there were 40 BTC of buying without an opposing seller. Every trade still had both sides. Delta identifies which side acted aggressively.

CVD accumulates these interval values:

CVDt=CVDt−1+Volume Deltat

A rising CVD indicates that buyer-initiated volume has been accumulating faster than seller-initiated volume within the selected calculation window. A falling CVD indicates the reverse.

What CVD does not show

CVD is based on executed transactions. It does not directly display all passive liquidity waiting in the order book.

For example, CVD does not by itself reveal:

• How much limit-order liquidity remains above or below the market.
• Whether displayed orders will remain available or be cancelled.
• Whether hidden liquidity exists.
• Whether one participant or many participants supplied the resting orders.
• Why a participant bought or sold.
• Whether the observed pressure will continue.

This limitation matters because passive liquidity helps determine the price result. Strong aggressive buying can produce little upward movement if sell orders repeatedly absorb it. Modest buying can move price farther when offers are thin or withdrawn.

CVD measures the balance of aggressive execution. Price reflects the result of that execution interacting with available liquidity.

Why price may not follow aggression

Assume repeated market buys execute at the ask. Buyer-initiated volume rises, producing positive delta. Two broad outcomes are possible.

In the first, available sell liquidity is consumed and price moves higher. Aggressive buying is translating into upward price progress.

In the second, new sell orders continue appearing at the same area. Large buyer-initiated volume executes, but price makes limited progress. The direct observation is positive delta with a weak price response. Passive absorption may be a possible explanation, but it is not proven by delta alone.

This is an important MindPillar principle:

CVD measures aggressive effort; price records the result of the wider auction.

Order-flow analysis becomes more useful when those two pieces are studied together rather than treating positive or negative delta as a standalone signal.

A simple transaction

Suppose the Bitcoin order book shows a best bid of 60,000 for 1 BTC and a best ask of 60,001 for 0.8 BTC.

Trader A places a buy limit for 1 BTC at 60,000. The order rests at the best bid and provides liquidity.

Trader B submits a market sell for 0.4 BTC. The sell order executes against Trader A’s resting bid.

The transaction can be described as follows:

• Trader A is the buyer.
• Trader B is the seller.
• Trader A provided liquidity.
• Trader B took liquidity.
• Trader B initiated the transaction.
• The 0.4 BTC is classified as seller-initiated volume.

This does not mean Trader B was correct about future direction. It only describes how the transaction occurred.

If additional market sellers arrive while new bids keep replenishing at 60,000, seller-initiated volume may accumulate even though price does not fall. That difference between aggressive effort and price response becomes relevant later when studying absorption and CVD divergence.

Common misconceptions

• ‍Limit orders always provide liquidity. A limit order provides liquidity only when it rests in the book. If its price crosses the spread, it can execute immediately and take liquidity. Some limit orders can be partly filled as takers and leave the remaining quantity resting as makers.‍
• Market orders always move price. A market order removes liquidity, but it does not necessarily change the best quote. If sufficient quantity is available at the best price, the order can execute without exhausting that level. Price moves through the book when incoming demand exceeds the quantity available at the current price or when quotes change.‍
• Positive delta means more buyers exist. Positive delta means more executed volume was initiated by buyers than by sellers during the measured interval. It does not mean the market contained more buyers than sellers.‍
• A large displayed order is guaranteed liquidity. A displayed limit order represents current interest, not a promise that the quantity will remain available. It may execute, change or be cancelled before another order reaches it.‍
• Makers are informed and takers are uninformed. Maker and taker labels describe execution roles. They do not establish identity, information quality, intent or likely profitability.‍

A beginner’s framework

When watching order flow, separate the process into five questions:

1. What liquidity was available? Look at the bids, asks and visible depth.
2. Which side initiated the trades? Identify whether buyers lifted asks or sellers hit bids.
3. How much volume executed? Measure the activity rather than relying on the number of trades alone.
4. How did liquidity respond? Did resting orders disappear, replenish or hold?
5. What did price do? Compare the aggressive effort with the resulting displacement.

This is an observational framework, not a trading strategy. It creates the vocabulary needed to understand delta, CVD, footprint charts and absorption without turning any single metric into a buy or sell instruction.

What comes next

Market and limit orders explain how liquidity is supplied and consumed. The next concept is the bid-ask spread: the gap aggressive orders cross to obtain immediate execution.

Continue with “The Bid, Ask and Spread: How a Trade Actually Happens” to learn how best prices, queue position and available depth shape each transaction.

This content is provided for educational purposes only and does not constitute financial, investment or trading advice. It does not provide trading signals or recommend any order type. Execution behavior, fees and order protections vary by venue and product. Always review the relevant platform’s current rules before placing an order.

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