Coase's Theorem for HR: When to Buy Talent, When to Build It, and Why Most Companies Get It Backwards

Q: Doesn't building take too long for a fast-growing startup?

Sometimes. Coase doesn't say 'always build' — he says count the real transaction cost. In a 40-person startup, a bad external VP costs you 6–12 months. That's often longer than promoting a smart internal person and coaching them.

Q: How does this apply to contractors and EORs?

Coase directly predicts the outsourcing boom: if the market has become efficient at delivering a service (payroll, cloud infrastructure, junior dev capacity), transaction costs fall and firms shrink around those functions. Employer-of-record services are Coase in action.

Q: What if my internal talent is genuinely weak?

Then your ports-of-entry hiring and your L&D are broken and no amount of external hiring will fix it — you'll just refresh the mediocrity every 2 years. Fix the intake.

60-Second Summary

Coase (1937) argued firms exist because using the open market has costs — search, negotiation, contracting, enforcement. When internal cost < market cost, do it inside. When market cost < internal cost, buy.
Applied to talent: build the role internally when the skill is firm-specific, tacit, and high-turnover-cost. Buy externally when the skill is general, codified, and cheap to verify.
Most companies invert this — they hire external senior leaders (high transaction cost, high failure rate) and outsource what they should be building (institutional knowledge, culture, IP-adjacent craft).
Internal labor markets (Doeringer & Piore, 1971) formalize this: ports of entry at the bottom, promotion ladders inside, and a wall between internal wage-setting and external market pressure.
Rule of thumb: if the skill takes >18 months to become productive at your company, build it. If it's productive on day 30, buy it.

A Series C SaaS company raised $80M and, within 9 months, hired six VPs externally — Product, Eng, Sales, Marketing, People, Finance. Two years later, four had left, one had been managed out, and the company was doing a reorg that essentially undid their org designs. This is not bad luck. This is Coase, unread.

What Coase actually asked

“The main reason why it is profitable to establish a firm would seem to be that there is a cost of using the price mechanism.”
— Ronald Coase, The Nature of the Firm (1937)

Coase — who won the Nobel in 1991 partly for this paper — noticed that mainstream economics had no explanation for why firms exist. If markets are efficient, why doesn't every worker just contract independently? His answer: markets have hidden costs — finding the right supplier, negotiating price, writing the contract, monitoring quality, enforcing terms. When those transaction costs exceed the cost of doing something inside, the firm expands. When internal bureaucracy costs exceed market friction, the firm contracts. The firm's boundary is set by that trade-off.

The four transaction costs of external hiring

The hidden cost of buying talent

1
Search cost
Sourcing, screening, interviewing, executive search fees (often 25–33% of first-year comp). For a VP hire, this is $80k–$200k before day one.
2
Information asymmetry
You know your business; they know their resume. On average, ~40% of external senior hires fail within 18 months (Heidrick & Struggles data).
3
Contracting and onboarding
Equity negotiation, relocation, sign-on, first-year severance protection, plus 90–180 days of ramp during which real output is often negative.
4
Cultural friction
The person imports the norms of their previous employer — and the org spends 12+ months either absorbing or rejecting them. This cost never appears on a spreadsheet.

40%

of external senior hires fail within 18 months

Heidrick & Struggles / Harvard Business Review

$213k

median cost of an external VP-level bad hire

SHRM aggregate estimate — search + comp + severance + ramp

2.6x

productivity of internally promoted managers in year one

vs. externally hired peers, Wharton study of 5,300 workers (2012)

18%

lower first-year pay for internal promotes

same Wharton study — and yet higher output

Internal labor markets — Doeringer & Piore

In 1971, economists Peter Doeringer and Michael Piore extended Coase into HR with the concept of the internal labor market. They observed that inside real firms, wages are not set by supply and demand every day — they're set by internal rules, promotion ladders, and administrative custom. The external market only touches the firm at 'ports of entry' (usually junior roles); everything above is internal.

Internal labor market vs external labor market

Internal labor market

Ports of entry: mostly junior roles
Wages set by ladder + calibration
Skills are firm-specific, tacit
Career trajectory > current market rate
High switching cost for both sides

External labor market

All levels open to outside hires
Wages set by market + counter-offers
Skills are general, portable, codified
Current comp > career narrative
Low switching cost — easy to replace

Most companies operate a chaotic mix — hiring externally at every level, then wondering why internal promotion is broken, calibration is impossible, and comp keeps re-baselining upward. Coase would tell them to pick one primary mode per role family and be honest about it.

The buy-vs-build decision matrix

The higher the tacit + firm-specific content of the role, the more you should build. The more codified + portable, the more you should buy.

Skill is…	Verification cost	Time to full productivity	Coase says
General & codified (e.g. accountant, SRE)	Low — certifications, trial tasks	30–90 days	Buy. Market is efficient here.
General but tacit (e.g. senior IC engineering)	Medium	3–6 months	Buy but pay for onboarding
Firm-specific & tacit (e.g. senior EM in your codebase)	High — no external test predicts it	12–24 months	Build. Almost always cheaper.
Firm-specific & codified (e.g. compliance for your product)	Medium	6–12 months	Build primary, buy as backfill
Executive with your customer, culture, and cap table context	Very high	18–36 months to be net-positive	Build — externals fail 40% of the time here

How to actually run this

Operating rules

1
Declare your ports of entry
Which levels does your company hire externally into by default? Write it down. 'IC1–IC4 external, IC5+ internal-first' is a real policy. Ambiguity is what creates the mess.
2
Build a real internal talent market
Public internal job board, transparent ladders, calibration across managers, and a rule that internal candidates get first look with a defined SLA. Without this, 'internal-first' is theater.
3
Set a build-vs-buy budget
Learning & development, rotations, and manager time to coach are the price of building. If L&D is <2% of payroll, you are structurally forced to buy.
4
When you must buy senior, buy in pairs
A single external VP with no internal ally will fail. Two coordinated hires, or one external + one strong internal promote as their deputy, cuts failure rate materially.
5
Reserve external hiring for genuine capability gaps
'We've never done X and cannot learn it fast enough' is a valid reason. 'The internal candidate isn't quite ready' usually isn't — that's a training decision, not a hiring decision.

The most common failure

Founders hire external VPs because they underestimate the transaction cost and overestimate the diagnostic value of a resume. Coase's answer isn't 'always build' — it's 'count all the costs before you buy'. Most companies count only the search fee.

FAQ

Frequently asked questions

Doesn't building take too long for a fast-growing startup?

Sometimes. Coase doesn't say 'always build' — he says count the real transaction cost. In a 40-person startup, a bad external VP costs you 6–12 months. That's often longer than promoting a smart internal person and coaching them.

How does this apply to contractors and EORs?

Coase directly predicts the outsourcing boom: if the market has become efficient at delivering a service (payroll, cloud infrastructure, junior dev capacity), transaction costs fall and firms shrink around those functions. Employer-of-record services are Coase in action.

What if my internal talent is genuinely weak?