#892 1984 · UK Government (Littlechild Report for BT) · Regulated utilities / telecommunications
Britain stopped paying its monopoly's costs and gave it RPI-X — the monopoly cut its fat
the problem
How do you regulate a privatised monopoly (BT) without paying for its inefficiency or smothering it with a cost audit?
background
When Britain privatised British Telecom in 1984, the inherited default was US-style rate-of-return regulation: the regulator watches what the firm spends, then allows a fixed percentage return on top of that base. The thing being counted is the firm's own spending, so profit is literally a mark-up on costs — the firm gets paid more the more it sinks into its rate base, and has no reason to find waste. Littlechild, asked to regulate BT, saw that this would reward exactly the fat a monopolist is famous for.
The alternatives on the table were not attractive: break BT up (politically and logistically vast), or audit every cost for eternity (a standing army of accountants, and endless gaming of what counts as allowed).
what everyone would do
The competent answer was rate-of-return regulation: count the cost base, allow a fair return, and audit heavily to keep the monopoly from padding it. It fails because the moment profit is a markup on cost, the firm's rational move is to inflate the cost base — the audit is always catching up with yesterday's game, and the audit itself becomes a permanent, costly apparatus.
what they saw
Littlechild saw that regulating profit is the wrong thing to measure. State the price, not the cost: cap the tariff at RPI-X and let the firm keep every saving. Then firm and customer want the same thing.
the move
Littlechild counted the output instead of the input: cap each regulated tariff at the retail price index minus X percent (RPI-X), set X at an aggressive productivity target, and let the firm keep everything it saved below that fixed price path. Nothing is forbidden — no profit ceiling, no cost audit — the firm is simply paid a fixed price and told to keep the difference.
why it works
Under cost-plus, what is counted is the firm's spending, so the firm's marginal profit rises with spending and every saving is profit forgone — the incentive is to waste. The price cap substitutes a fixed price for the counted cost, so what is now counted no longer responds to the firm's behaviour: on the next unit it earns (price minus its own cost), and the lower its cost, the more it keeps. The firm's objective flips from inflating the added cost to shrinking it, which is exactly the behaviour customers want, with no sanctions or inspections required. The regulator only has to pick X; the firm does the finding.
the payoff
BT's X factor ratcheted from RPI-3 to RPI-7.5 as the company beat the target, forcing real price falls while margins and service held up.
where it breaks
It fails when the regulator cannot hold the fixed price: if X is set too loose at reset time, the monopoly banks windfalls (Britain's first controls on electricity and water were over-generous and produced exactly that), and if the firm lobbies each review, the cap turns back into bargaining. It also relies on the firm being able to find savings — a monopoly with no unused fat or no threat of future competition can coast or quietly cut quality while skimming price, because nothing forbids degrading service under a pure price cap. And the savings are a one-time fund: once found, future X must be reset to stay meaningful.
what came after
RPI-X became the standard for privatised gas, water, electricity and airports across the UK, was copied by the US FCC for telecom price caps in 1989, and spread worldwide as the default way to nudge a monopoly toward efficiency before competition arrives.
references
- [1]World Bank — Has Price Cap Regulation of U.K. Utilities Been a Success?World Bank (Public Policy for the Private Sector No. 132), 1997documents1.worldbank.org
- [2]Institute for Government — The Privatisation of British Telecom (1984)Institute for Government, 2010instituteforgovernment.org.uk