Does Spending More On Marketing Actually Work?

Key Insights

“Spend more to make more” holds up to a point. Past that point, an extra dollar stops producing an extra dollar of result.
Most channels have a ceiling built into who they can reach and how often, so the return on spend changes shape as the budget grows.
Measuring the true return on marketing spend is harder than a dashboard suggests, which is part of why the saying survives unchallenged.
A channel can keep reporting strong numbers long after it has quietly stopped producing anything beyond its own cost.
The missing half of the sentence is a question, not a warning: which half of this budget is still on the rising part of the curve?

What the Saying Leaves Out

“Spend more to make more” is true, for a while. Every marketing channel has a point where an extra dollar stops producing an extra dollar of result. Past that point, the relationship between spend and outcome stops being a straight line. The sentence never mentions that point, so it gets repeated like a rule that never runs out.

Why the Curve Bends

A channel doesn’t fail all at once. It reaches a ceiling gradually, tied to how many people it can profitably reach and how often it can reach them before the same audience gets tired of seeing it. Spend below that ceiling and more budget buys more results in roughly the same proportion. Spend above it and the same extra dollar buys a smaller and smaller slice of new attention, even while the total cost keeps climbing.

This isn’t a rare edge case. A 2026 survey of more than 300 advertisers by Taboola and Qualtrics found that roughly three in four performance marketers had already noticed diminishing returns on their social advertising specifically. For most of them, it wasn’t a small effect either. Over 30 percent of their spend was landing past the point where it was still doing proportional work.

Why It's Hard to Notice From the Inside

Part of the reason the saying survives is that most businesses don’t have a clean way to see the bend in the curve while it’s happening. A dashboard reports a number with confidence, and confidence reads as accuracy, even when the two aren’t the same thing.

Academic research backs this up more starkly than most marketers expect. A study published in the Quarterly Journal of Economics ran 25 large randomized advertising experiments and found that the uncertainty around each one’s true return was often more than 100 percentage points wide. In plain terms, the data often couldn’t reliably tell the difference between a campaign that did nothing and one that was modestly profitable. If that’s true even inside carefully controlled experiments, it’s a reasonable bet that a normal monthly dashboard isn’t picking up the bend in the curve either. It just keeps reporting a confident number until someone finally checks it against what the business actually made.

The Missing Half of the Sentence

The useful question was never whether to spend more. It’s which half of the current budget is still on the rising part of the curve and which half already crossed into the flat part. That’s a different exercise than cutting the budget, and a different one than growing it. It means testing a change in one place at a time and watching what actually moves, the same approach that helps separate real results from borrowed credit, the pattern covered in the piece on why Google Ads often takes credit for sales other channels helped make, or budget that’s just gone quiet without anyone noticing, covered in the piece on where a twenty thousand dollar monthly budget actually leaks.

Same budget, more results, starts with knowing which half of the sentence a business is actually standing in.

How to Check Which Half You're In

None of this requires new software or a bigger analytics team.

Look at cost per result over time, not just total results. If a channel’s total output is still climbing but the cost to get each new customer is climbing faster, that channel has already crossed into the flat part of the curve, even though the top-line number still looks healthy.

Increase spend on one channel at a time, not all of them together. Raising three budgets at once makes it impossible to tell which increase actually produced anything. A single, deliberate increase, held for a few weeks and compared against the weeks before it, shows the real shape of that channel’s curve.

Ask what the extra dollar had to compete for. A channel running near its ceiling is often bidding against itself for the same small pool of remaining attention, which is a different problem than a channel that simply hasn’t been given enough budget yet to find out.

This is not an argument against spend or budgets

This isn’t an argument against growing a marketing budget. Plenty of businesses are genuinely under-invested and have real room on the rising part of the curve. It’s a caution against treating “spend more” as a rule that applies the same way forever, at every size, on every channel, without ever checking where the bend actually is.

Related reading: the Articles hub collects more pieces on where marketing budgets actually go, including a closer look at why advertising platforms often take credit for sales they didn’t fully earn and why twenty thousand dollars a month can look busy while still losing half its value. For a longer conversation on this topic, see the KRTCL HIT podcast.

Behtash Moojedi writes on marketing budgets, attribution, and growth, drawn from 12 years of finding results inside budgets companies already have.

‘Spend More to Make More’ Is Only Half a Sentence.