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What is liquidity?
Liquidity is how easily an asset can be bought or sold without moving its price — and how much money is sloshing through the system overall.
At the level of a single asset, liquidity means how easily you can buy or sell a meaningful amount without significantly moving the price. Deep, liquid markets (like major currency pairs) absorb large trades easily; thin markets can move sharply on relatively small orders.
At the level of the whole financial system, 'liquidity conditions' describes how freely money and credit are flowing — driven heavily by central bank policy. Tighter liquidity (higher rates, shrinking central bank balance sheets) tends to pressure risk assets and, historically, emerging-market currencies especially hard, since they often depend on dollar funding from abroad.
This is why an emerging-market currency pair reacting to dollar strength isn't only about the exchange rate — tightening dollar liquidity can squeeze an economy well beyond what the currency chart alone shows.
See it in the data
USD/ZAR's historical context note in the Dollar ↔ Gold Lens covers exactly this liquidity channel.
See the EM currency relationship