Economy
What the unemployment rate actually measures
The headline number is a household survey statistic with a narrow definition of unemployment. Knowing what sits inside it — and what sits outside — changes how…
October 10, 2026
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Latest News
Markets
Stock Market Hours Around the World Explained
Every stock exchange sets its own hours on its local clock. Here is what a trading day is, why sessions differ by city, and how holidays change the schedule.
October 6, 2026
Investing
How Compound Interest Builds Wealth Over Decades
Compound interest pays you on your past gains. See a simple example, the Rule of 72, and why time matters more than clever picks.
October 10, 2026
Markets
Markets
An $11.16 million presale and a $1 million Bitcoin call: what the press release actually establishes
The numbers in the Pepeto announcement are real claims from a real source. That is not the same as verified evidence.
October 3, 2026
Markets
A presale press release, read closely: what Apeing's Stage 6 numbers do and don't establish
The wire copy sells timing and a 1,500% ROI. The arithmetic inside it tells a more cautious story.
October 1, 2026
Markets
What a stock's short interest ratio actually tells you
Days-to-cover is a snapshot built from twice-monthly data. It measures exit difficulty, not destiny.
September 13, 2026
Investing
Investing
A high backtest Sharpe ratio proves little: what real validation requires
Reported Sharpe ratios inflate with every unreported trial, and the corrections that account for this are arithmetic, not opinion.
August 28, 2026
Investing
How many signals were tested before this one worked?
Multiple testing turns luck into apparent skill. What the correction procedures control, the hurdles the replication literature settled on, and what a corrected…
August 21, 2026
Economy
Economy
Inflation Explained: What It Is and Why It Bit
A plain-language look at how rising prices are measured, what pushed them up after 2021, and why a little inflation is considered healthy.
September 22, 2026
Economy
The Backtest Trap: Why a Great Historical Track Record Doesn't Prove a Forecasting Model Works
AI-driven trading and forecasting tools are often sold on the strength of impressive backtested results. Here is the mechanism by which those results can be…
August 12, 2026
Analysis
Analysis
What does out-of-sample mean in a forecasting paper?
Out-of-sample scoring is the only published test that approximates live trading, and most papers still manage to overstate it.
August 26, 2026
Analysis
What replaced the guidance that has governed bank models since 2011?
Federal regulators rewrote model risk management guidance in April 2026, keeping the same validation core built around conceptual soundness and outcomes…
August 19, 2026
Finance News
Finance News
SEC settles its first AI-washing cases for a combined $400,000
Two advisers paid penalties in March 2024 for overstating their use of machine learning, and the orders turn on the gap between claimed and actual model use.
August 24, 2026
Finance News
Every backtest is one of many: what the trial count does to measured performance
Ten trials are enough to yield an in-sample Sharpe ratio of 1.57 from strategies with zero expected out-of-sample performance. What validation, multiple-testing…
August 17, 2026
Don't Miss
Economy
How do GDP nowcasting models work?
Nowcasts combine early-release data into a current-quarter estimate before the official number exists — with published error rates worth reading.
January 8, 2026
Analysis
What transaction costs do to a backtest's promised returns
Spread, impact and timing drag compound with turnover — and the strategies they kill are usually the high-Sharape, high-frequency ones.
April 14, 2026
Investing
How does the wash-sale rule actually work?
A 61-day window, a substantially identical security, and a deferred loss — the mechanics as the IRS writes them.
February 18, 2026
Markets
Implied volatility is a price, realized volatility is a measurement
The two numbers answer different questions, and the measurable gap between them is a premium, not a forecast.
December 30, 2025