---
id: "prereq-billable-hour-model"
type: "prereq"
source_timestamps: ["¶9"]
tags: ["industry-knowledge", "finance"]
related: ["concept-value-based-pricing", "claim-billable-hour-obsolescence"]
reason: "Understanding why AI threatens professional services revenues requires knowing that these firms historically make money by charging clients for every hour an employee works."
sources: ["reskilling"]
sourceVaultSlug: "hbr-seg-reskilling"
originDay: 10
articleStem: "hbr-edu-45-consulting-firms-hire-talent"
sourceUrl: "https://hbr.org/2025/10/how-ai-is-upending-how-consulting-firms-hire-talent"
sourceTitle: "How AI Is Upending How Consulting Firms Hire Talent"
---
# The Billable Hour Model

**Why you need this:** Understanding why AI threatens professional services revenues requires knowing that these firms historically make money by charging clients for every hour an employee works.

The text assumes the reader understands the mechanics of the **billable hour** — the standard pricing mechanism in law and consulting where revenue is directly tied to time spent on tasks. Without this context, the urgency of switching to fixed-fee pricing in the face of AI efficiency is lost. This underpins [[concept-value-based-pricing]] and [[claim-billable-hour-obsolescence]].


## Related across articles
- [[prereq-consulting-business-model]]
- [[prereq-consulting-economics]]
- [[prereq-partner-track-leverage]]