Costco Membership Renewal — Loyalty Moat Signal

Costco's business model is unique:

Retail margins are deliberately thin (~12-13%) to drive massive volume, while ~$5B in annual membership fee income flows almost entirely to operating profit.

The membership renewal rate (consistently 92-93% in US/Canada) is the most important business health indicator — a 1% decline in renewal rates would cost ~$500M in annual fee income at current membership levels.

The signal triggers when management raises membership prices (last done in 2024 from $65→$65 Gold, $130→$130 Executive) — Costco has raised fees 9 times since 1983, each time without meaningful member loss.

A fee increase announcement historically rallies the stock 3-5% as investors price in the nearly-pure-profit revenue increase with minimal churn risk, confirming the loyalty moat's pricing power.