In plain English
Every activity in a value chain can be done inside the firm, bought from a supplier, or run with a partner. The decision is not about control for its own sake — it is about which arrangement leaves the least value on the table once you allow for the cost of writing and enforcing contracts.
The advanced view
Williamson: markets are efficient until asset specificity (site, physical, human, dedicated), uncertainty and transaction frequency make contracts incomplete enough that ex-post bargaining destroys the ex-ante investment incentive. Grossman-Hart-Moore adds that ownership is the allocation of residual control rights, so integration should go to the party whose non-contractible investment matters most.
Two economic effects push toward integration for different reasons. Hold-up: a supplier who has invested in equipment usable only for you can be squeezed, so it under-invests unless protected by ownership or a long contract. Double marginalisation: when an upstream monopolist and a downstream monopolist each add a margin, the final price is above the level that maximises joint profit, so integration raises volume, lowers price and raises combined profit.
The make-or-buy comparison
Buy cost = supplier price × volume + contracting and monitoring cost Make cost = variable cost × volume + fixed cost + capital charge Capital charge = invested capital × WACC Integrate if Make cost + flexibility loss < Buy cost + hold-up cost Break-even volume = fixed cost + capital charge / (price − variable cost)
Worked example — make or buy
Step 1 of 8
- 1Volume 500,000 units, supplier price 40 ⇒ buy cost =
Frameworks
Make / buy / ally
Three governance modes on a continuum from spot market to full ownership, with contracts, JVs and alliances in between.
Asset specificity
Site, physical, human, dedicated and brand specificity. The main driver of contractual hazard.
Value chain configuration
Which links you own, which you orchestrate, which you buy on price.
Ecosystem / platform
Value created by complementors you do not own. Governance replaces ownership; the bottleneck is the asset to control.
Common pitfalls
- ×Comparing supplier price to in-house variable cost only, ignoring the capital charge.
- ×Integrating for 'security of supply' when a dual-source contract does the same job cheaper.
- ×Ignoring that integration converts variable cost into fixed cost and raises operating leverage.
- ×Assuming an in-house unit will match a specialist's scale and learning curve.
Must know cold
- ✓Hold-up risk rises with asset specificity, uncertainty and frequency.
- ✓Double marginalisation: integrating two successive monopolies lowers price and raises joint profit.
- ✓Integration raises operating leverage — check downside volume, not just base case.
Exercises
Try each one on paper before revealing the worked solution.
Exercise 1
A telecom operator debates owning fibre versus leasing wholesale access at 12 per home per month. Building costs 900 per home passed, opex 2 per home per month, WACC 8%, useful life treated as perpetual. Which is cheaper per home?
Strategy connection
Boundary decisions are where strategy shows up on the balance sheet: integration turns opex into capex, raises invested capital, and lowers ROIC unless the margin gain is larger than the capital added.