How price and liquidity actually form from the mechanics of orders, spreads, and trading - the physics beneath the tape.
Market microstructure is the study of how the trading process itself shapes prices: how orders interact in the book, how the bid-ask spread compensates market makers, how liquidity appears and evaporates, and how a large order moves the market against itself. It is the layer beneath the clean price series, where the messy reality of execution lives.
For anyone acting on real-time data, microstructure is not academic. Slippage, adverse selection, and the market impact of your own trading determine whether a signal that looks profitable on paper survives contact with the market. Understanding it is what separates a backtest that assumes frictionless fills from a strategy that accounts for the cost of actually trading.
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