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The Sharpe Ratio: What It Measures and Where It Misleads

The Sharpe Ratio: What It Measures and Where It Misleads

The Sharpe ratio, a widely cited yardstick of risk-adjusted performance, measures return earned per unit of risk. What it captures well, and its four blind spots: it treats gains and losses alike, assumes well-behaved returns, can be inflated by smoothed prices, and stays a noisy estimate.

Jul 18, 2026 · 10 min read

Rebalancing: The Discipline and What It Costs

Rebalancing: The Discipline and What It Costs

Rebalancing returns a portfolio to its target weights to hold the risk you chose — not to chase return. Why its first job is risk control, where the conditional "rebalancing bonus" comes from, what spreads and stamp duty cost, and how to choose between a calendar rule and a tolerance band.

Jul 18, 2026 · 9 min read