2 Monster Stocks to Hold for the Next 10 Years

Costco reported fiscal Q3 sales up 11.6% Y/Y (comps +9.8%—best since early pandemic) and ended the quarter with 82.9M members (+4.1% Y/Y), supporting a steady growth outlook. MercadoLibre posted Q2 revenue +50% Y/Y, GMV +36%, with unique buyers +26% and fintech MAUs +30%, alongside rising ecosystem users (+37%) driving materially higher GMV and payments per user. Overall, the article is a bullish long-term pitch on COST and MELI based on strong operating momentum.

Analysis

COST is functioning like a quality hedge on consumer downgrading: when households trade down, club traffic and renewal rates tend to stay sticky, which can keep same-store sales above the rest of hardlines/food retail for longer than the market expects. The second-order winner is usually not just COST but adjacent share-takers in private-label and value logistics; the losers are discretionary-heavy chains like TGT and smaller club operators such as BJ if they cannot match the value stack without margin damage. The near-term risk is that investors confuse inflation pass-through with real unit share gains, so the stock can still de-rate even if operating momentum stays solid.

MELI is a deeper structural story: the ecosystem effect should translate into better monetization of payment flow, credit, ads, and insurance rather than just GMV growth. That creates pressure on regional fintechs and local marketplaces that rely on one product line, because MELI can cross-subsidize acquisition and raise switching costs with logistics and financial services. The key variable is not user growth alone but whether credit losses and funding costs stay contained as the platform pushes further into financial intermediation.

Contrarian view: both names are high quality, but the market may already be paying for a long runway of perfection. COST likely needs continued comp acceleration or a new membership fee catalyst to avoid multiple compression, while MELI needs proof that ecosystem engagement converts into durable operating leverage rather than just top-line share. Over 1-3 months, the cleaner setup is relative-value rather than outright beta; over 6-18 months, MELI has the larger upside if LatAm digitization keeps compounding and the credit cycle stays benign.

Key Decisions for Investors

• Long MELI / short AMZN for 3-6 months as a relative-growth pair: MELI has the stronger ecosystem monetization runway, while AMZN’s LatAm exposure is less proprietary; cut if MELI revenue growth decelerates sharply or if credit losses inflect.
• Buy COST only on a 5-8% pullback or via staggered entries over the next 2-4 weeks; use TGT or XRT as a hedge if consumer sentiment weakens, since COST can still de-rate if comp momentum normalizes.
• If already long COST, consider a covered-call overwrite into earnings to harvest premium and offset valuation risk; the thesis breaks if comps slip back toward low-single digits or membership renewal rates soften.
• Watch MELI’s next earnings for operating leverage in payments and credit quality metrics; if fintech take-rate expands without a spike in provisions, add on weakness. If NPLs rise faster than GMV, exit the long.
• Pair trade idea: long COST / short BJ over 1-2 quarters if wholesale value-trading remains strong, as COST’s scale and executive-member mix should sustain better margin resilience.