Concept Architecture
Concept
Theoretically, Cost Disease describes the tendency for costs to rise in labour-intensive sectors where productivity growth is slower than in technologically progressive sectors. It is grounded in Baumol?s model of unbalanced growth, in which wages increase across sectors because workers can move between industries, even when productivity growth differs. In healthcare, cost disease arises because many clinical services require direct labour inputs that cannot be reduced substantially without altering the service itself.
Mathematically, cost disease is represented by the difference between wage growth and labour-productivity growth. When healthcare wages rise in line with wages elsewhere in the economy but healthcare output per worker grows more slowly, unit labour costs increase. The effect is estimated using sectoral wage, labour-input, output and productivity data.
In practice, cost disease is assessed through longitudinal comparisons of healthcare wages, productivity and unit costs. Analysts estimate the proportion of healthcare expenditure growth attributable to labour-cost pressure rather than population ageing, technological change or increased service intensity. The concept is applied in long-term expenditure projection, workforce planning and health-system financing.
Purpose
Used to explain and project healthcare cost growth caused by wages increasing faster than labour productivity in labour-intensive health services.
Mathematical Formulae
Primary Formula
ULC? = W? / A?
where:
- ULC? = healthcare unit labour cost
- W? = healthcare wage per worker
- A? = healthcare output per worker
Supporting Formulae
Growth in unit labour cost:
gULC,? � gW,? ? gA,?
Under economy-wide wage equalisation:
gW,? � gA,?
Therefore:
gULC,? � gA,? ? gA,?
where:
- gA,? = productivity growth in the progressive sector
- gA,? = productivity growth in healthcare
Related Mathematical Methods
- Baumol Effect
- Unit Labour Cost Analysis
- Productivity Growth Analysis
- Healthcare Expenditure Projection
- Two-Sector Growth Model
- Time-Series Analysis
Example
Average wages in the wider economy increase by 3.5% annually, while productivity in a labour-intensive community nursing service increases by 1.0%.
Estimated unit labour cost growth:
gULC,? � 3.5% ? 1.0% = 2.5%
The service therefore experiences an estimated annual cost increase of 2.5% attributable to the gap between wage and productivity growth.
Excel Implementation
| Function | Example Formula | Health Economics Application |
|---|---|---|
| PRODUCT | =B2/C2 | Calculates unit labour cost from wages and output per worker. |
| POWER | =(B3/B2)^(1/(A3-A2))-1 | Calculates annualised wage or productivity growth. |
| LET | =LET(WageGrowth,B2,ProductivityGrowth,C2,WageGrowth-ProductivityGrowth) | Estimates cost-disease growth. |
| SLOPE | =SLOPE(LN(OutputPerWorkerRange),YearRange) | Estimates trend productivity growth. |
| FORECAST.LINEAR | =FORECAST.LINEAR(FutureYear,UnitCostRange,YearRange) | Projects unit healthcare costs. |
VBA (Optional)
VBA can automate long-term healthcare expenditure projections under alternative wage and productivity assumptions.
Sources
- Baumol WJ, Bowen WG. Performing Arts: The Economic Dilemma. Twentieth Century Fund.
- Baumol WJ. Macroeconomics of unbalanced growth: the anatomy of urban crisis. American Economic Review.
- Hartwig J. What drives health care expenditure? Baumol?s model of unbalanced growth revisited. Journal of Health Economics.
- Colombier C. Drivers of health-care expenditure: what role does Baumol?s cost disease play? Social Science Quarterly.
- Zweifel P, Breyer F, Kifmann M. Health Economics. Springer.
Related Concepts (2)
Library
Publications
1
Uncertainty and the Welfare Economics of Medical Care — Kenneth J. Arrow, Vol. 53, No. 5 ed., 1963 (American Economic Review)
The founding paper of health economics as a discipline, analysing how uncertainty, asymmetric information, trust and the special features of medical markets prevent them from behaving like ordinary competitive markets — the intellectual origin of the entire field.
Journal ArticleView source →
Frequently Asked Questions (6)
What is cost disease?
A phenomenon in which the cost of services in labour-intensive, low-productivity-growth sectors, such as healthcare, rises persistently relative to more automated sectors.
Source: Baumol & Bowen 1966
How is cost disease related to the Baumol effect?
Cost disease is the name given to the consequence of the Baumol effect for the price of certain services. Because sectors with little scope for productivity growth must still raise pay to keep workers who could earn more in fast-growing sectors, the cost of their output climbs relative to goods made by ever more productive means. In services such as health, education, and live performance this shows up as a persistent real rise in cost. The mechanism is the Baumol effect; cost disease is its visible result. Baumol (2012) draws out this link.
Source: Baumol 2012
Why does cost disease occur?
Cost disease occurs because labour is mobile and wages tend to rise across the economy as productivity grows in the more automated sectors, obliging labour-intensive sectors to raise wages too in order to keep staff. Since output per worker in those sectors grows little, the higher wages are not offset by greater productivity, so unit costs rise. The disease is thus driven by productivity growth elsewhere combining with slow productivity growth within the affected sector.
Source: Baumol & Bowen 1966
Why is health care prone to cost disease?
Health care is prone to cost disease because much of it consists of skilled personal services, such as examination, diagnosis, and care, that resist automation, so productivity, measured as output per worker, grows slowly. Yet health care must pay wages competitive with the wider economy to attract and retain skilled staff. The combination of slow productivity growth and economy-wide wage rises pushes the relative cost of care up persistently, which cost disease predicts for such labour-intensive services.
Source: Baumol & Bowen 1966
What does cost disease imply for health policy?
Cost disease implies that some of the persistent rise in health care costs is structural, a consequence of the sector's labour intensity rather than of waste, so policies aimed solely at eliminating inefficiency will not remove the underlying pressure. It suggests that rising health spending may be an expected feature of a wealthy economy, and that responses should distinguish structural cost growth from avoidable waste. It also directs attention to genuine productivity gains as the route to relief, where these are possible.
Source: Baumol & Bowen 1966
How does cost disease differ from inefficiency?
Cost disease differs from inefficiency in its cause: inefficiency is waste, using more resources than necessary for a given output, whereas cost disease is the rising relative cost of a sector whose productivity grows slowly while economy-wide wages rise. A sector can suffer cost disease while being efficient, since its costs climb through the wider wage pull, not through waste. Confusing the two can lead to policies that seek to cut waste where the real pressure is structural.
Source: Baumol & Bowen 1966
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Verified by Dr Darrin Baines
British health economist
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Verification date: 9 Sep 2025
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