Demand for marketing agency services has climbed sharply in the AI era, but widespread late client payments undercut that growth. A Kaplan Group report, combining Bureau of Labor Statistics data, two decades of Google Trends, and B2B payment research, shows that search interest in "marketing agency" surged while nearly all agencies wrestle with invoices that arrive weeks or months past due.
Average U.S. search interest for "marketing agency" rose from 12.9 in the 2010s to 47.3 across the 2022 to 2025 window, a gain of roughly 266%. Over the same period, interest in "advertising agency" fell about 15%, and searches for the broader term "advertising" dropped roughly 15%, while "marketing" grew modestly from 50.4 to 58.6.
How widespread are late payments
Even as demand builds, late payments create a structural drag on agency finances. Data from Ignition's 2025 Agency Pricing and Cash Flow Report shows that 97% of agencies regularly deal with late client payments, and 71% say at least one in every four invoices is paid late. More than half, 56%, report that late invoices take two weeks to two months past the due date to collect.
The time drain is significant: 84% of agencies spend between three and 10 or more hours each month chasing overdue invoices. As a result, 63% describe their cash flow as unpredictable.
AI accelerates demand for agency services
The search interest for "marketing agency" stepped up in 2020 and 2021, then climbed sharply from 2022 onward, coinciding with broad adoption of generative AI tools. The most recent data shows an average search interest of 48.8, signaling that businesses are actively seeking outside marketing help as AI reshapes their strategies.
Where agency demand is hottest
The Kaplan Group built a state-level Trend Score that blends search interest with labor-market fundamentals. The top states for agency demand and strong employment and wage data for marketing and advertising roles include:
- Oregon
- Virginia
- New York
- New Jersey
- Maryland
Digital media supply chain under heavier strain
The digital media and advertising supply chain shows even sharper payment deterioration. OAREX's H1 2025 Digital Media and Advertising Payments Study found that 58% of digital media payments were late in the first half of 2025, up from 49% in the prior period. Payments more than five days late reached 32%, and those more than 15 days late hit 18%, both record highs. The share of consistently on-time payers dropped from 53% to 43% in a single reporting period.
Why this matters for marketing professionals
Agencies that strengthen payment terms, invest in collection processes, and price in risk will turn the AI-driven demand into stable margins. The data makes clear that chasing late invoices eats into the very growth agencies are working to capture. For marketing leaders, pairing new business momentum with disciplined receivables management is no longer optional - it's the difference between a boom that pays off and one that strains the firm's survival.
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