Prediction: Costco Could Be Worth More Than Home Depot and Lowe's Combined by 2030. Here's the Math.

Costco’s membership flywheel is cited as driving recurring revenue: membership-fee revenue rose to $4.06B in the first 36 weeks of fiscal 2026 from $3.60B, while net sales grew 9.6% YoY and the chain reached 931 warehouses. The article argues Costco can surpass the combined market cap of Home Depot ($327B as of Aug. 31) and Lowe’s ($115B) by 2030 with mid-single-digit growth (e.g., ~$526B at 6% compounding vs. ~$517B for the pair at 4%). Main risk noted is valuation compression if growth slows amid potential weakness in housing/renovation demand.

Analysis

Costco is the cleaner quality compounder, but the more interesting setup is the relative spread against home-improvement. Its membership prepay model makes a larger share of revenue feel annuity-like, and that matters when household budgets tighten: the first dollars protected tend to be groceries, gas, and value-heavy replenishment, not discretionary renovation. That creates a second-order winner set in staple-like basket share and a loser set in cyclical home projects, where demand deferral tends to hit higher-margin categories first.

For HD and LOW, the risk is not just softer ticket counts; it is a slower mix toward repair-and-maintenance and away from larger discretionary jobs, which can pressure gross margin leverage and inventory turns. The spillover is negative for adjacent suppliers in flooring, paint, cabinets, and appliances if project starts remain weak for another 2-4 quarters. COST’s downside is different: the equity already prices in persistent share gains, so any membership slowdown, traffic deceleration, or multiple compression could erase the fundamental resilience.

The contrarian miss is that this is less a "COST to the moon" story than a duration trade on consumer stability versus housing cyclicality. If rates fall and housing turnover re-accelerates into 2026, the relative advantage to COST narrows quickly. Conversely, if mortgage rates stay sticky and renovation deferral persists, the HD/LOW basket can underperform for months even if the companies execute well.

Key Decisions for Investors

• Prefer a relative-value long COST / short HD+LOW basket over an outright long COST; thesis is multiple durability and defensive basket share, not explosive earnings upside. Horizon: 3-12 months.
• Use earnings season and housing datapoints (existing home sales, mortgage rates, homebuilder traffic) as the catalyst window for initiating/adding to the pair; if housing inflects higher, the short leg loses edge quickly.
• For investors already long COST, consider trimming or hedging with a partial HD or LOW short rather than adding fresh long exposure at a premium multiple; the upside is slower than the valuation implies.
• Watch for falsifiers: a clear membership growth deceleration, weaker renewal commentary, or sustained COST multiple compression would undercut the quality-premium thesis.
• If looking for a tactical short within the home-improvement complex, favor LOW over HD on lower scale and less balance-sheet flexibility; re-rate risk is higher if discretionary demand stays soft.