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The **Order Bump Bias** is a psychological phenomenon in e-commerce and sales where a customer, having already committed to a primary purchase, is highly susceptible to adding a small, complementary, and low-friction offer—the "order bump"—to their cart just before completing the transaction. This bias leverages the psychological momentum of the initial commitment, making the small, additional decision feel insignificant in comparison to the larger one already made. It is distinct from an upsell, which typically replaces the original item with a more expensive one, or a cross-sell, which is often presented earlier in the shopping journey.
The effectiveness of the order bump lies in its placement and perceived value. By presenting the offer directly on the checkout page, the customer is already in a state of high commitment, having entered their payment details and mentally finalized the purchase. The order bump is typically a highly relevant, low-cost item (usually under 25% of the main product price) that requires only a single click to add. For example, a customer buying a $100 online course might be offered a $15 "Quick Start Checklist" or a "Bonus Template Pack" on the checkout page. The perceived value of the add-on is high, while the additional cost is low, making the decision to add it almost automatic and highly profitable for the seller, significantly increasing the Average Order Value (AOV) [1].
The Order Bump Bias is driven by several core psychological mechanisms that converge at the point of purchase:
| Mechanism/Theory | Explanation |
|---|---|
| Commitment and Consistency | Once a customer has made the significant decision to purchase the main product, they are psychologically committed to the transaction (Sunk Cost Bias). Adding a small, related item is seen as a consistent, minor extension of that primary decision, rather than a new, high-friction choice [2]. |
| Anchoring and Contrast Principle | The price of the order bump is anchored against the much larger price of the main purchase. A $20 add-on to a $200 purchase feels negligible (a 10% increase), whereas a $20 purchase on its own would require more deliberation. The contrast makes the bump seem like a small, easy win [3]. |
| Impulse Buying and Frictionless Purchase | The order bump is presented at the moment of highest buying intent, encouraging an emotional, impulse decision. The one-click, "check-the-box" mechanism removes all transactional friction, bypassing the rational part of the brain that might otherwise veto the purchase [4]. |
| Perceived Scarcity and Urgency | Order bumps are often framed as a "one-time offer" or "only available now," leveraging the principle of scarcity. This creates a fear of missing out (FOMO) on a highly relevant, discounted item, forcing an immediate decision before the opportunity is lost [5]. |
“The order form bump is one of the most powerful things you can do to increase your average cart value. It's a small, relevant offer that they can add with a single click, and because they've already committed to the main purchase, the friction is almost zero.”
— Russell Brunson, Co-Founder of ClickFunnels