Why Does Amazon Trade at a Discount to Walmart and Costco? Here's the Only Answer That Makes Sense.

Amazon trades at just over 20x expected 2026 earnings, versus 37x for Walmart and more than 44x for Costco, after Amazon's multiple fell sharply from its historical level above 50x. Investors are discounting Amazon's planned $220B of annual capex, largely for AI and cloud infrastructure, amid uncertainty over the near-term returns from AI compute spending. The article argues Walmart and Costco's defensive premiums may also be excessive and advises avoiding all three stocks while AI-driven macro concerns remain unresolved.

Analysis

The relevant dislocation is not simply AMZN cheap versus COST/WMT expensive: it is a duration swap. AMZN’s multiple is being discounted for an uncertain capital-intensity cycle, while COST and WMT embed both recession resilience and a low-volatility scarcity premium. That makes the retailers vulnerable to de-rating even if their earnings hold, whereas AMZN only needs AI capex to translate into stable AWS backlog, improving utilization, or slowing capex growth for its valuation overhang to ease.

Near term (days to weeks), this is unlikely to be a clean directional catalyst because defensive flows can persist during macro uncertainty. Over 1-3 months, AWS revenue growth, cloud operating-margin progression, and management commentary on 2027 capex commitments are the decisive AMZN inputs; the market needs evidence that incremental infrastructure is monetized rather than merely deployed. For COST/WMT, the key risk is that same-store sales remain solid but valuation support weakens as rates rise or risk appetite returns—an earnings beat may no longer offset multiple compression.

The non-obvious second-order effect is that retailers’ elevated valuations constrain their strategic optionality: acquisitions, incremental price investment, or wage spending become harder to justify if investors begin demanding earnings yield rather than defensiveness. Conversely, AMZN’s retail margin and advertising cash generation can subsidize cloud investment longer than pure-play AI infrastructure buyers can, potentially improving AWS competitive positioning versus MSFT and GOOGL if weaker customers rationalize capacity spend. The contrarian view is that AMZN’s capex concern is underappreciated if utilization lags: a sustained gap between AWS growth and capex could impair free-cash-flow conversion for several quarters despite healthy reported operating income.

Key Decisions for Investors

• Initiate a 3-6 month relative-value position: long AMZN / short equal-dollar COST and WMT basket. Target 10-15% relative outperformance if AMZN rerates modestly while retail multiples normalize; exit if AWS growth decelerates for two consecutive quarters or 2027 capex guidance rises without corresponding backlog/RPO acceleration.
• For a defined-risk implementation, buy AMZN 6-month call spreads financed partly with COST or WMT put spreads, rather than naked retailer shorts. The setup benefits from relative multiple convergence while limiting losses if a macro shock extends the defensive-premium trade.
• Do not add to COST/WMT on routine comparable-sales beats at current valuation; require either a material earnings-estimate upgrade or a 15-20% multiple compression before revisiting. Monitor long-end Treasury yields and consumer-discretionary leadership as early indicators of defensive-flow reversal.
• Set an AWS watch alert around quarterly revenue growth, operating margin, and disclosed remaining performance obligations. A material improvement in backlog-to-capex visibility is the trigger to increase AMZN exposure; evidence of lower utilization or cloud price concessions falsifies the thesis.