For over a century, both the prestige and budget of a corporate department have been measured by a single crude metric: headcount. If you manage 500 people, you’re a “distinguished leader.” If you manage five, you’re a footnote. This “empire of headcount” has governed everything from office square footage to C-suite influence. It’s the fundamental unit of the 20th-century P&L. In an enterprise powered by federated agentic systems, this math is not just obsolete—it is a liability. AI will reshape the enterprise. The question is now “Which line items on the P&L change, and by how much?” Labor and benefits contract. Token and infrastructure costs appear as a new operating line. Compliance costs shift from reactive rework to proactive provenance. And the assets that matter most—structured knowledge enclaves, trained agent policies, decision logs—do not yet appear on most balance sheets.…