Here's a word origin most people in this business have never stopped to think about.
"Agency" comes from the Latin agere, to act or to do. Agens is "one who acts." An agent is, literally, a person who acts on behalf of someone else. That relationship, acting for another under their direction, is the textbook origin of fiduciary duty. In law, agency is still defined as a consensual relationship where one party acts on behalf of and under the control of another.
So when Forrester titled its big agency report for this year "Predictions 2026: Marketing Agencies Resign Their Agency," the pun was exact. They're saying the industry is resigning the one job the word was built around. Forrester's lead analyst on it, Jay Pattisall, put it flatly on LinkedIn: the age of the agent is ending.
I think he's right about the trend. I think most agencies haven't noticed they're standing in it.
What Forrester actually predicted
The headline number is a forecast of a 15% cut in agency headcount in 2026, up from an average 8% in 2025. One anonymous holding-company CEO gave Forrester the quiet part out loud: by 2028, "we'll double profits and halve the people."
But the layoffs aren't the real story. The model shift underneath them is.
Forrester's argument is that agencies stop being agents and become what they call "purveyors." Merchants. The report lays out the modes: some agencies execute programs as vendors, some resell software and media as merchants, some feed their capabilities into bigger matrixed organizations as affiliates. Pattisall's own line is that your agencies will no longer act solely as your agents but also as owners of products, resellers of technology partnerships, and developers of their own tools.
Read that again. Owner. Reseller. Those are not neutral roles. A reseller makes more money when you buy more of its catalog. An agent makes more money when you win. Those two things are not the same, and for a long time the industry pretended they were.
The clearest version of the conflict
If you want to see the incentive flip in one practice, look at principal media.
Principal media is when the agency buys ad inventory itself, then resells it to you at a markup. Arbitrage. Forrester expects it to hit roughly a third of total agency billings in 2026. That's the moment, in their words, an agency crosses the threshold from buyer to owner.
Marketers already smell it. The ANA's March 2026 study found 90% of client-side marketers say their top concern is whether recommended principal media is actually in their best interest, up from 79% in 2024. Only 57% of companies have any governance rules around it at all. One respondent said it cleaner than any analyst could: "I don't know if my agency is recommending principal media because it's the best media for me, or the best media for them."
That's the whole thing. Not fraud. Just an incentive that points the wrong way.
And this isn't new. Back in 2016, the ANA's K2 Intelligence investigation found markups of 30 to 90% on principal and inventory deals, and surfaced a philosophical split that still defines the fight: advertisers thought their agency owed them a duty beyond the contract, while some agency execs said the relationship was solely defined by the contract. Agent versus merchant, in one sentence.
Why this is happening now
Money. Specifically, other people's money.
Forrester reports that 78% of the top 80 digital media agencies have now taken private equity or venture capital. Every round of that, they note, moves the agency's vision further from agnostic service and toward selling enterprise platforms. When your owner needs a return, you sell what you own.
The live proof showed up four days ago. On June 8, 2026, Accenture agreed to acquire the creator and social agency Whalar, a shop Whalar itself called the largest creator-economy transaction yet. A creative agency getting absorbed into a global consulting-and-technology firm is exactly the "affiliate inside a matrixed org" Forrester described. The incentive after a deal like that is to deploy the parent's technology and scale, not to stay your neutral guide.
I want to be fair here, because the honest version matters. A lot of clients buy principal media on purpose. The ANA found 76% cite lower cost as the main benefit, with real savings on some buys. Plenty of marketers accept the trade knowingly. The problem was never that markups exist. It's that the markup is often undisclosed and unauditable, and that you can't fix a structural conflict with a disclosure form. You can't contract trust.
The reframe for agencies and MSPs
If you run a partner agency or an MSP, Forrester just handed you a strategy question disguised as a prediction.
The pressure is to build your own product or stack and resell it, or to resell someone else's. Both turn you into a merchant. Both put a catalog between you and your client's actual interest. The day you have something of your own to push, your recommendation stops being clean, and good clients can feel it even when they can't name it.
There's a third option, and it's the boring structural one that actually holds. Stay your client's agent. Sell your judgment, not a SKU. When the technical work is heavier than you can carry, partner with someone invisible enough that you keep owning the relationship, the voice, the pricing, and the strategy. You deliver the engineering without becoming a reseller of anyone's stack, including your own.
That's the model we built Kief Studio around for this audience. Your brand, our engineering, we stay invisible. We have active white-label engagements running right now under NDA, a fashion and marketing agency, a marketing and PR firm, and a technology partner. In every one of them, the agency stays the agent. We never touch the client. There's no catalog we're trying to push through your account, because we don't have one pointed at your clients.
The industry's incentives are flipping in public this year. You don't have to flip with them. The agencies that keep the word "agency" meaning what it originally meant, someone who acts on your behalf, are going to look very different in a few years from the ones that quietly became merchants.
If you're trying to take on bigger technical work without becoming a reseller to do it, that's worth a conversation. The first one is free, no commitment. Reach us at kief.studio/contact.