When CAC climbs, the reflex is to cut ad spend. That usually makes things worse: less spend means less data, weaker optimization, and a smaller business. The brands that lower CAC sustainably do it by making the same traffic worth more.
1. Lift conversion rate (CVR)
This is the highest-leverage move. If 2% of visitors buy instead of 1%, you have just halved your CAC with zero extra spend. CVR is a funnel problem: page speed, offer clarity, trust signals, and a checkout without friction.
Where to look first
Check your add-to-cart to purchase ratio. If lots of people add to cart but few finish, the problem is the checkout (hidden costs, forced account creation, slow load). If few add to cart at all, the problem is the landing page (weak offer, unclear value, no social proof).
2. Lift average order value (AOV)
If each customer spends more, the cost to acquire them is spread over more revenue. Bundles, free-shipping thresholds, and post-purchase upsells all raise AOV without raising ad spend.
Quick AOV levers
A free-shipping threshold just above your AOV (for example, "free shipping over ₹999" when AOV is ₹800) nudges people to add one more item. Bundles and "buy 2, get X" offers do the same.
3. Extend lifetime value (LTV)
CAC only looks expensive when you measure first purchase. If a customer you paid ₹500 to acquire buys four times, the effective CAC is ₹125 per order. Retention is the quiet CAC killer.
What moves LTV
Post-purchase email and SMS flows, subscription offers for consumables, and a reorder reminder for products with a natural repurchase cycle. These cost almost nothing and compound.
The CAC formula in one line
Write it down: CAC = spend ÷ (clicks × CVR × AOV × repeat rate). Spend and clicks are the expensive levers. CVR, AOV, and repeat rate are the cheap ones. Most brands can cut CAC 30% to 50% by fixing the cheap levers before touching spend.
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