Freight Is a Retention Lever: What Shipping Costs Reveal About Customer Behavior
June 2026 | Marketplace Economics | Industrial Organization | Empirical Research Note | ← Back to Blog
This analysis draws from a working paper on profit-aware pricing in two-sided marketplaces, examining customer retention and repeat purchase behavior across 110,840 transactions from the Olist Brazilian e-commerce marketplace.
The Finding
Freight is not just a logistics cost. It is a customer retention lever.
In the marketplace I analyzed, I estimated how product and order characteristics affect the probability that a customer comes back. Price had a negative effect on retention, as expected. What surprised me was freight.
The freight coefficient on repeat purchase probability was -0.076. The price coefficient was -0.079. Freight has a comparable marginal effect on repeat purchase probability as product price. The coefficients are close in magnitude, though not identical.
"Platforms that treat freight as a logistics expense are missing something. Geographic shipping subsidies and free shipping thresholds are retention-relevant design decisions, whether or not the platform intends it."
The Geographic Dimension
That finding becomes more significant when you look at geography.
Freight costs in this marketplace are not uniform. Customers in the North and Northeast pay 50 to 80 percent more in freight than the Southeast baseline, largely driven by distance from distribution centers.
These two results interact through geography to create a geographic wedge in effective prices. Freight affects retention at a comparable magnitude to price, and freight is also the lever that varies most by geography. Customers in high-freight regions are less likely to return, independent of product or seller differences.
What This Means for Platform Design
Free shipping thresholds are usually thought of as conversion tools. This finding suggests they are also retention tools. The customer who paid high freight on the first order is less likely to return. Lowering that cost changes the decision.
Most platforms optimize price extensively and treat freight as a cost to minimize rather than a lever to optimize. The propensity modeling here suggests that framing misses something. Freight is not just an input cost. It is part of the total cost faced by the customer and it affects whether they come back.
In regions where freight costs are structurally high, customers face a retention disadvantage that has nothing to do with product quality or seller performance. A free shipping threshold or a regional freight subsidy changes that disadvantage directly.
The Platform Design Implication
Platforms that treat freight as a logistics expense are missing something. Geographic shipping subsidies and free shipping thresholds are not just operational choices. They are retention-relevant design decisions, whether or not the platform intends it.
In IO terms, freight costs that vary systematically by geography function as a form of implicit geographic price discrimination. Customers in different regions face structurally different total prices for the same product. The retention data suggests this discrimination has real consequences for platform health, not just for individual transactions, but for which customers the platform keeps.
Shipping policy, in other words, is market design. The platform that recognizes this has a lever that most of its competitors are ignoring.
Conclusion
The comparable magnitude of freight and price effects on repeat purchase probability is not merely a statistical curiosity. It reframes how platforms should think about shipping costs, not as a logistics problem to minimize, but as a retention lever to optimize.
This analysis is part of a broader working paper on profit-aware pricing in two-sided marketplaces, examining demand elasticity estimation, profit optimization under cost uncertainty, customer lifetime value modeling, and implementation frameworks across 110,840 transactions from the Olist Brazilian marketplace. The full paper is available on my research page.
