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You asked

Why do returning customers buy again but spend less each time?

Repeat purchase rate improves while average order value declines — discount-driven win-back campaigns drive returns but anchor transaction values below baseline producing compounding AOV decay across the purchase sequence.

Symptom

The distortion lives in repeat purchase rate — it counts transactions without measuring transaction value creating the appearance of healthy retention while AOV declines with each successive purchase in the sequence.

Cause

Win-back campaigns offering discount-depth incentives drive the return visit but establish a lower price expectation for the customer relationship — the discount anchoring effect persists beyond the discounted transaction into third and fourth purchases.

Impact

To hold prior period revenue flat the business needs 28% more transactions at current AOV — margin per transaction is compressed from both directions as revenue falls while fulfillment cost stays variable with volume.

Full diagnostic context

Repeat purchase rate improves while average order value declines — discount-driven win-back campaigns drive returns but anchor transaction values below baseline producing compounding AOV decay across the purchase sequence.

The distortion lives in repeat purchase rate — it counts transactions without measuring transaction value creating the appearance of healthy retention while AOV declines with each successive purchase in the sequence.

Win-back campaigns offering discount-depth incentives drive the return visit but establish a lower price expectation for the customer relationship — the discount anchoring effect persists beyond the discounted transaction into third and fourth purchases.

To hold prior period revenue flat the business needs 28% more transactions at current AOV — margin per transaction is compressed from both directions as revenue falls while fulfillment cost stays variable with volume.