a16z: AI shopping agents could shake up a $500B advertising profit pool
a16z Newsletter · rss · 2026-09-30
An a16z Newsletter essay analyzes how AI shopping agents threaten marketplace profit pools.
Key points
- Consumer internet profits hinge on owning discovery: Amazon's 2025 ad revenue ($69B) exceeded its ex-AWS operating income ($34B); Alphabet and Meta combined for nearly $500B in ad revenue. Even partial redistribution could fund a whole new business model.
- The early split: Amazon bans Muse while Instacart and Shopify embrace it — Amazon has bargaining power and established habits; the others see upside with less ad revenue at risk.
- Agents can reroute the stack (order via Toast, deliver via DoorDash Drive), bypassing marketplace commissions and ads, a 'headless' shift.
- Whether this ends well depends on whether agents generate incremental demand that offsets lost per-order economics; Instacart's AI-assisted orders already show larger baskets.
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