Rule: use paid as a bridge during the Stage-1 invisible window when LTV:CAC ≥ ~3:1 and CAC payback is within cash-flow tolerance — not a permanent substitute for the owned asset

Rule: Use paid as a bridge during the Stage-1 invisible window (J-curve Stage 1 — invisible window (≈Months 0-6): Google must crawl, index, and accrue trust; traffic is near zero regardless of content quality) only when both conditions hold:

• LTV:CAC ≥ ~3:1 (LTV:CAC ≥ 3:1 — standard unit-economics gate for whether paid acquisition is rational; below ~1:1 paid is destroying value)
• CAC payback within cash-flow tolerance (commonly cited target: under ~12 months; see McKinsey SaaS analysis (100+ public SaaS companies) — CAC payback top-quartile median 16 months, bottom-quartile median 47 months for the McKinsey SaaS benchmarks)

Paid is the rational bridge when the cost of invisibility (lost high-intent customers) exceeds the cost of renting traffic. It is not a permanent substitute for the owned asset.

Why: Bridging keeps the business out of "dark" during months 0-6 when organic is structurally near-zero. But running paid forever (as a substitute) means the J-curve never delivers — the business stays in the rented-traffic model and pays the auction cost (Owned vs Rented (cost over time) — organic: high upfront/sunk, marginal cost falls as pages rank ("buying a house"); paid: linear ongoing, stops when spend stops, auction CPCs trend up ("renting")) indefinitely.

How to apply: Default plan: budget bridge paid for months 0-9 with a planned ramp-down in months 9-12 as organic comes online. If LTV:CAC drops below ~3:1 at any point, cut paid spend back to the level where it holds; do not subsidise unhealthy paid economics with the SEO budget.