Marginal ROAS measures whether the next dollar spent in a channel covers its own cost, not the channel’s average performance. This matters because the same math applies whether a brand optimizes for profitability or growth. Without that discipline, brands keep funding saturated channels instead of the ones actually driving results. This video explains how to apply that same scrutiny across every channel in the media plan.
Why Marginal ROAS Matters Whether You’re Optimizing for Growth or Profitability
Marginal ROAS matters whether you’re optimizing for growth or profitability because the underlying math is the same either way: the question is always whether the next dollar spent in a channel is still covering its cost. John Wallace explains that most firms optimize for long-term profitability by default, but some deliberately accept short-term negative returns to buy market share, often using outside capital to fund it. That’s a legitimate strategy, but not an indefinitely sustainable one; eventually a firm has to generate a profit or break even.
Regardless of which objective a brand is chasing, Wallace argues the math converges: every channel, tactic, and campaign needs to answer whether the profit or revenue from the most recent dollar invested covers its cost. As channels saturate, that marginal return declines, and discipline means reallocating toward channels still fueling growth rather than continuing to fund ones that no longer pay for themselves, whether that spend sits at the top, middle, or bottom of the funnel.
In this video, you’ll learn:
The fundamental economic difference between prioritizing short-term growth and long-term profitability
Why buying market share requires a strategic, disciplined approach to capital deployment
The importance of calculating the marginal return on every dollar invested across all marketing channels
How to identify when a marketing channel has become saturated and when it is time to pivot resources
Why all media planning, from bottom-funnel to top-funnel tactics, should be subjected to the same rigorous financial scrutiny
TIME STAMPFull Video Transcript: Marginal ROAS for Growth and Profitability Explained
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In this video, LiftLab CEO John Wallace explains why the math behind marginal ROAS holds steady whether a brand is optimizing for growth or profitability.
[0:00 – 0:34] Optimizing for Profitability Versus Growth
Most firms are going to optimize for profitability over the long term. That is what economics say. We are in unique situations sometimes where we are optimizing for growth if we are willing to accept negative returns or negative profitability for the short term. What we are doing in those conditions is we are buying market share. We are growing and buying market share. Quite often if you are able to depend on outside capital, that is the whole contract: let us go put capital in that we would not have had otherwise in order to buy market share to make an asset that is worth more. It is a noble cause, but over the long term, according to just principles of economics, it is not necessarily sustainable. At some point that firm has to generate a profit or break even.
[0:35 – 1:26] The Economics of Marketing Spend
Whether your short term objective is revenue or your short term objective is profitability, it actually works out to a lot of the same math. We need to know whether the next dollar that we are spending on one of our seven channels is accretive. Clearly, in the very beginning of the spend in these channels, you can get both profitability and growth. As you saturate the channels or run out of channels to spend on, you will eventually run out of profitable spend to deploy. Knowing that you are at that point and consciously spending past it is something that I totally endorse if that is your objective. If you are setting out to do that, you still would not want to spend the majority of your budget into a low growth channel. We want to have an awareness of that and spend on some of the other marketing channels that are actually fueling more growth. Even if we are going to run and spend investors or some outside capital, let us still do it in a disciplined way.
[1:27 – 2:29] Maintaining Discipline in Media Planning
In LiftLab, whether you are a high profit company and that is your objective or a high growth company and that is your objective, a lot of the math works out the same way. What we need to know is for every one of the places where we are spending in the media plan, every one of our marketing channels, every one of our tactics that is typically below the channel, or even some of the campaigns that are our major campaigns that we are spending on, we need to know if the profit or revenue coming from the most recent dollar invested at a certain spend level is covering the cost. If we put another dollar in, is the revenue or the profit coming from that covering the cost? That is what we need to answer. If we find a channel where that answer is false, we should be considering spending on one of the other channels, and we need that same information in the same reliable way. We are putting the entire media plan under the same level of scrutiny whether it is on the bottom of funnel, middle of funnel, or top of funnel. We need to answer for that brand, that audience that they are targeting, and that price point that they are selling at, that same question over and over again: are we covering the costs with the revenue that is coming in?
Key Lessons: Applying Marginal ROAS Across Every Marketing Channel
Financial discipline in marketing: Every marketing dollar must be accountable; companies need to determine if the incremental revenue generated by a campaign covers the cost of that investment.
Strategic resource allocation: Companies should continuously monitor performance across all seven marketing channels to ensure they are not pouring budget into low-growth tactics.
The role of outside capital: While using investor capital to drive rapid growth is a common and noble strategy, it is not sustainable indefinitely. Eventually, the firm must transition toward a break-even or profitable model.
Unified scrutiny: Whether focusing on brand awareness (top-of-funnel) or direct sales (bottom-of-funnel), marketers must apply the same level of analytical rigor to justify the spend for their specific audience and price point.
