First-Touch vs. Last-touch Attribution: Why Both Are Wrong for Ecommerce

Are you wondering why first-touch and last-touch attribution models are failing your ecommerce business? It is because they are fundamentally broken. These single-touch models provide a simplified view of a complex customer journey, crediting only one interaction for a sale. If you rely on them, your marketing attribution is giving you a false picture of reality.

The Problem: A Broken Compass for Your Marketing Budget

Unlike multi-touch models that attempt to distribute credit, single-touch systems create a distorted view of performance. For ecommerce brands, this means misallocating budget and failing to understand the true drivers of growth.

You're spending tens of thousands of euros on marketing every month, but your Return on Ad Spend (ROAS) is a black box. You credit the last ad a customer clicked before buying, but what about the blog post they read three weeks ago? Or the TikTok video that first introduced them to your brand? First-touch and last-touch attribution models are simple, but they are fundamentally broken. You overinvest in bottom-of-the-funnel channels that are good at “closing” but do not actually create new demand, like branded search and retargeting. You cut the budget from top-of-funnel channels that introduce new customers to your brand, slowly starving your business of future growth. You are rewarding the wrong channels and penalizing the ones that are actually building your brand. This is not just inefficient; it is a slow-motion disaster for your brand's growth. You are losing money every single day by trusting these models.

What Are First-Touch and Last-Touch Attribution? A Flawed Foundation

See also: First-Touch vs. Last-Touch Attribution: Why Both Are Wrong

First-touch and last-touch attribution are the most basic forms of marketing attribution. Unlike more complex models, they are single-touch systems, meaning they assign 100% of the credit for a conversion to a single touchpoint. For Dutch ecommerce brands, this simplicity is a trap that hides the true complexity of customer behavior.

First-touch and last-touch attribution are the most basic forms of marketing attribution. They are single-touch models, meaning they assign 100% of the credit for a conversion to a single touchpoint. First-Touch Attribution gives all the credit to the very first interaction a customer has with your brand. The formula is simple and wrong: Conversion Value = 1 * First Touchpoint. Last-Touch Attribution gives all the credit to the very last interaction before a conversion. The formula is equally flawed: Conversion Value = 1 * Last Touchpoint. These models are common because they are the default in many analytics platforms. Many Dutch ecommerce brands, especially in the competitive beauty and fashion sectors, default to these models out of convenience, without realizing the hidden costs.

The High Cost of Simplicity: Why First-Touch Fails

First-touch attribution overvalues discovery channels and completely ignores the important nurturing and conversion touchpoints that follow. Unlike a complete measurement approach, it gives 100% of the credit to the first interaction, providing a skewed and incomplete picture of marketing performance. For ecommerce, this leads to undervaluing the channels that actually close sales.

The core flaw of first-touch attribution is that it overvalues discovery and ignores everything that happens after. It gives all the credit to the channel that started the conversation, not the one that closed the deal or nurtured the relationship. Imagine a potential customer in Amsterdam who first discovers your new vegan cosmetic line via a TikTok influencer. They follow your brand, see a few more of your ads on Instagram, read a review on a Dutch beauty blog, and then, two weeks later, they see a retargeting ad on Facebook and finally make a purchase. With first-touch attribution, the TikTok influencer gets 100% of the credit. The Instagram ads, the blog review, and the Facebook ad get zero. You are left thinking that only TikTok works, while in reality, it was a complex interplay of channels that led to the sale. You pour more money into top-of-funnel channels, expecting them to drive sales on their own. When they do not, you conclude that the channel is ineffective and cut the budget, when in reality, you have simply failed to invest in the rest of the customer journey.

Last-touch attribution is a biased model that gives full credit to the final touchpoint before a conversion, ignoring all preceding interactions. Unlike causal analysis, which identifies true drivers of behavior, last-touch over-rewards channels that capture existing demand, like branded search. This leads to poor budget allocation and stagnating growth.

Last-touch attribution has the opposite problem. It gives 100% of the credit to the final touchpoint, ignoring all the preceding interactions that built awareness and desire. This model is biased towards channels that are good at capturing existing demand, not creating it. Consider a shopper in Rotterdam who is looking for a specific type of organic face cream. They search on Google for “organic face cream Netherlands” and click on your Google Shopping ad. They browse your site, leave, and then later search for your brand name directly. They click on your branded search ad and make a purchase. Last-touch attribution gives 100% of the credit to the branded search ad. It completely ignores the fact that the customer would have never searched for your brand if they had not first discovered you through the Google Shopping ad. You are led to believe that branded search is your most valuable channel, when in fact it is just harvesting the demand created by other channels. This creates a self-fulfilling prophecy of channel cannibalization. You see that branded search has a high ROAS, so you invest more in it. This inflates your branded search traffic, which in turn makes your last-touch ROAS for that channel look even better. Meanwhile, your top-of-funnel channels are being starved of budget, and your overall growth stagnates. You are trapped in a cycle of rewarding the channels that take the credit, not the ones that create the value.

The Messy Middle: Where Your Sales Are Actually Made

The messy middle is the complex, non-linear customer journey between the first touchpoint and the final purchase. Unlike the simplified path assumed by single-touch attribution, this phase involves a loop of exploration and evaluation across multiple channels. Ignoring this reality means you are blind to where marketing truly influences customer decisions.

The fundamental flaw with all single-touch attribution models is that they ignore the reality of the modern customer journey. Google calls this the “messy middle,” the complex space between the first touch and the final purchase where customers explore, evaluate, and are influenced by a multitude of touchpoints. [1] In the messy middle, your customers are not on a linear path. They are looping between exploration and evaluation, triggered by different needs and exposed to a wide range of information. They might see an ad, then search for reviews, then visit your website, then get distracted, then see a retargeting ad, then talk to a friend, and then finally make a purchase. Single-touch attribution tries to pick one of these moments and call it the winner. This is like trying to give one person credit for a team victory. By ignoring the messy middle, you are ignoring the very place where your marketing has the greatest opportunity to influence behavior. You are flying blind, with no visibility into how your different marketing activities are working together to move customers through their journey. You are leaving money on the table, and you do not even know it.

The only way to break free from the limitations of single-touch attribution is to move beyond attribution altogether. Instead of asking “which channel gets the credit?”, you need to ask “what is the incremental impact of each marketing activity?”. This is the core principle of causal inference. Stop guessing and start knowing. Causal inference is not just a better attribution model. It is a fundamentally different way of thinking about marketing. It is about understanding the cause-and-effect relationships that drive your business, so you can make decisions with confidence. It is about moving from a world of guesswork to a world of scientific precision. As Judea Pearl, the father of causal inference, writes in The Book of Why, “Data are profoundly dumb.” Data can tell you that something has happened, but it cannot tell you why. For that, you need a causal model.

By understanding the true cause and effect of your marketing, you can sharpen your spend for maximum growth.

What is the main problem with first-touch attribution?

First-touch attribution is problematic because it only credits the first marketing touchpoint, completely ignoring all subsequent interactions that nurture the customer and lead to a conversion.

Why is last-touch attribution misleading for e-commerce brands?

Last-touch attribution is misleading because it gives 100% of the credit to the final touchpoint before a sale. This heavily favors channels like branded search and retargeting, which capture existing demand rather than creating it. This leads to poor budget allocation and ultimately stunts the long-term growth of the brand.

Are multi-touch attribution models better than single-touch?

While multi-touch models are a step up from single-touch, they are still flawed. They are based on arbitrary rules and correlations, not causation. They still do not tell you the incremental impact of your marketing spend.

What is a better alternative to first-touch and last-touch attribution?

Causal inference is the superior alternative to traditional attribution models.

How does causal inference work?

Causal inference uses advanced statistical methods to distinguish correlation from causation. It analyzes your data to understand the true cause-and-effect relationships between your marketing activities and your sales. This allows you to see the incremental impact of each channel, rather than just assigning credit based on arbitrary rules and flawed models.

Find your true ROAS.

[1] https://www.thinkwithgoogle.com/consumer-insights/consumer-journey/the-messy-middle/ [2] https://www.amazon.com/Book-Why-Science-Cause-Effect/dp/046509760X