liquidity - definition
Liquidity definition. Explained for Australia forex traders. Plain-English, no jargon. Calculation example included.
Liquidity in forex refers to the ease with which a currency pair can be bought or sold without causing a significant price change. High liquidity means there are many buyers and sellers in the market, allowing orders to execute quickly at stable prices. Liquidity is highest during overlapping trading sessions (e.g., London–New York) and lowest during holidays or after-hours trading.
Formula
None. Liquidity is measured qualitatively by bid–ask spread width, order-book depth, and trade volume—not by a single formula.
Example
An Australian trader places a market order to sell 500,000 AUD/USD at 10:30 AM Sydney time (overlapping with Tokyo). The order fills instantly at 0.6520 with only a 0.2-pip slippage. This demonstrates high liquidity because the large trade moved the price minimally.
Edge cases
- Thin markets: During Australian public holidays (e.g., Australia Day), AUD pairs may show reduced liquidity even during regular session hours.
- Exotic pairs: AUD/TRY (Turkish lira) often has wide spreads and low order-book depth, making it illiquid regardless of session.
- ASIC regulation: Australian brokers under ASIC must disclose liquidity risk in their Product Disclosure Statement, especially for CFD trading on illiquid pairs.
See also
- spread
- slippage
- majors
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