Turn expertise into a clear reason to choose.

The Wall Street Journal reports Deloitte expects traditional labor-based work to shrink sharply as AI agents grow, while McKinsey says more than 30% of its global fees are now tied directly to client outcomes. The shift transfers risk: firms must absorb overruns, defend subjective success measures and manage lumpier payouts.

For sellers and marketers, effort is no longer the pitch — a measurable scorecard, a fixed output and proof the result held are what sells.

For firms, the marketing task is to make outcomes legible before the proposal stage. Publish the scorecard you’ll be paid against — the metric, the baseline, the timeframe — and proof that the result held after the engagement ended. Vague transformation language cannot carry an outcome fee. Sales conversations need to surface how the client will judge success while the measure can still be shaped, because defending a subjective result after the fact is where these deals sour. For vendors selling into firms, the logic applies one level down: whatever helps a firm measure and deliver against a promised outcome is an easier purchase than another efficiency tool.

Reuters reports Grant Thornton Advisors’ $5 billion cash purchase of CBIZ would create the fifth-largest U.S. professional, tax and advisory provider, on a platform spanning more than 20 countries, after backing from New Mountain Capital. Weeks later, PE-backed Sorren — itself formed from 13 accounting firms — launched an affiliated law firm through a management-services structure, following KPMG and Aprio into legal services.

Sellers now compete not firm-to-firm, but platform-to-firm: broader service lines, shared technology investment and a national story behind a familiar local name.

For marketers, consolidation changes both the competitor set and the brand problem. Platform firms must make a national story feel local — shared technology and broader service lines behind a name the client already trusts — without flattening the reputations they acquired. Independent firms need a sharper answer to u201cwhy not the platform?u201d: senior attention, specialization and continuity a roll-up cannot promise credibly. Sellers into this market should re-map buying centers too: platform deals centralize technology and vendor decisions, so a relationship with one office no longer guarantees the account. Sell the platform’s scale priorities, or sell the independence story — the middle is disappearing.

Bain and LinkedIn’s 2026 buyability research, based on a February survey of 750 buyers by NewtonX, finds finance, legal and procurement ‘hidden buyers’ hold roughly half of decision influence, and that vendors are far more likely to win when the whole buying group already knows and trusts them. About 40% of deals stall on group disagreement, not a competitor win.

For firms, marketing must arm the whole room early — with peer proof and a decision a sponsor can defend if it goes wrong.

The practical shift is to market to the people who can quietly end the deal. Finance, legal and procurement reviewers need their own content: total-cost and risk framing for finance, security and compliance evidence for legal, commercial terms and referenceability for procurement. Give the internal sponsor material they can forward without editing — a one-page business case, peer proof from a similar firm, and a clear answer to what happens if it goes wrong — because defensibility is what they are actually buying. Sales teams should multi-thread early and treat a single enthusiastic sponsor as a warning sign, not a pipeline stage.