Options Greeks Explained: Delta, Gamma, Theta, Vega, Rho
A clear, math-honest guide to the five Greeks — with a worked Black-Scholes chain, delta and theta charts, and sources you can verify.
Market Education
Learn how stocks, bonds and capital markets work. Explore plain-English explanations, worked examples and charts, then follow related coverage to connect market concepts with current events. Find your way around ECMSource.
Gamma Squeeze Explained: Why GameStop Wasn’t One
A gamma squeeze forces dealers hedging calls to buy stock, pushing it higher. Here’s the mechanism, how to spot one, and why GameStop wasn’t one.
How Stock Market Circuit Breakers Work: MWCB and LULD
How US market circuit breakers halt trading — the 7%, 13%, 20% S&P 500 triggers and the single-stock LULD bands that pause runaway moves.
RSI Explained: Formula, Overbought Levels, Divergences
How the Relative Strength Index measures momentum, why 70/30 aren’t magic numbers, and how RSI divergence warns of trend exhaustion.
Cisco Beats Q4 but Stock Falls 8%: AI Orders Squeeze Margins
Cisco reported record Q4 revenue of $17.3B and $4B in AI infrastructure orders, but the stock fell 8.4% as gross-margin mix and FY27 guidance disappointed.
Moving Averages Explained: SMA, EMA, 50/200 Cross
SMA and EMA in plain English: exact formulas, a worked example, the 50/200 Golden Cross, and the traps that fool most traders.
Bond Duration and Convexity Explained (With Examples)
Bond duration and convexity in plain English: what they measure, the formulas that matter, worked examples on real Treasury yields, and the traps that catch retail investors.
Leveraged & Inverse ETFs: Why Daily Reset Kills Returns
TQQQ, SQQQ, SOXL: leveraged and inverse ETFs reset every day. Here is why 3x can fall 53% while its index rises 8%, and when to use them anyway.
Insider Trading Explained: Legal, Illegal, and 10b5-1 Plans
How Section 10(b), Rule 10b-5, Form 4 filings, and 10b5-1 trading plans separate legal insider activity from federal crimes.
The Sharpe Ratio Explained: Formula, Uses, and Traps
Sharpe ratio, made simple: the formula, a worked example, long-run values for stocks, bonds, and Berkshire, and the traps that make it lie.