Fulfilment data has a direct impact on whether customers complete a purchase. If stock is wrong, delayed, or unclear, conversion suffers before the order is even placed. IBM's research on inventory visibility and customer experience draws a direct line between real-time stock accuracy and purchase confidence. Marketing efficiency depends on fulfilment accuracy Customers are far more likely to buy when they can trust that what they see on the site is actually available. Real-time data reduces friction and gives people confidence to move forward. It also makes marketing more effective. If traffic is sent to products that are no longer available, ad spend is wasted and conversion rates drop. Better fulfilment data improves the return on every click because fewer customers are led into dead ends. Mirakl's research on out-of-stock costs puts a number on exactly this leak — demand a retailer already paid to generate, lost at the final step. Higher conversion rate, because availability matches what's promised on the page.Better return on ad spend, because traffic isn't wasted on products that can't ship.Fewer support tickets and less firefighting for the team behind the scenes. A quiet lever with an outsized effect The operational benefit is just as important. When the data is clean, teams spend less time fixing errors and more time supporting growth. We saw this play out directly with a DTC fragrance and beauty retailer, where rebuilding real-time inventory visibility and merchandising around live stock lifted conversion rate by 10% without touching price, promotion, or traffic. Better fulfilment data is not just about efficiency. It is one of the quietest and most effective ways to improve conversion across the whole business. Where to look for quick wins Identify your highest-traffic products and confirm their displayed availability matches reality in real time.Check whether any current ad spend is driving traffic to low-stock or frequently-unavailable products.Measure cancellation rate specifically for stock-related reasons, separate from every other cause. Fixing even the highest-impact gap first often pays for the wider project. This is the same approach behind our eCommerce growth work — treating conversion, retention and fulfilment together, because growth that ignores fulfilment isn't growth.