cost basis · TWR vs MWR · corporate actions
📖 PnL & ROI
Notes on the question every broker app answers differently: did I make money? Cost basis and weighted average, realized vs unrealized, why deposits break every subtraction, fees and a tax charged on proceeds rather than profit, corporate actions that drop the price without losing a dong, and the invariant that ties it all back to the ledger.
Sources: hands-on brokerage portfolio-accounting notes · GIPS / performance-measurement literature · public corporate-action documentation.
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