How Stock Market Circuit Breakers and Trading Halts Work
How stock market circuit breakers and trading halts work, per SEC and FINRA sources: limit up-limit down bands, five-minute pauses and market-wide halts.
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Data & infrastructure
A clear view of the process, from raw data to responsible decisions.
How Consumer Price Index Inflation Is Calculated
How consumer price index inflation is calculated: BLS sources on price collection, index areas, item strata, geometric means and where the evidence stops.
Market Order vs Limit Order vs Stop Order Explained
Market order vs limit order vs stop order explained with FINRA material: how each executes, what triggers a stop order and where the evidence stops.
Backtest Overfitting and the Sharpe Ratio: What to Check
Backtest overfitting and the Sharpe ratio: why the ratio is a statistical estimate, how annualizing can mislead, and what SEC marketing rules say.