Market liquidity, when not taken for granted, is a complex topic that has no quick and easy explanation, measure or analysis. Without liquidity, a market cannot really exist, so most economic, valuation and risk models assume a high level of liquidity. Any other assumption is just too messy: how exactly does one go about modelling a market when one of its required characteristics – liquidity – is in short supply or non-existent?
Both the Wall Street Journal and Investopedia define liquidity simi
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