Check whether the intervention removes the actual bottleneck.
Supply-side benefits often take time and require suitable course design, incentives, infrastructure and employer demand. Programmes use scarce public funds and can benefit groups unevenly. Market-oriented reforms may improve incentives or competition, but weak regulation or barriers to entry can limit their effect. A reduction in labour cost is not the same as a productivity gain, and higher potential output need not immediately become higher actual output if demand stays weak.
- Additional gains
- Judge what the programme changes compared with what would happen without it. New equipment may need trained staff and reliable energy to work; funding the purchase alone does not establish a productivity gain.
- Capacity and use
- Potential output is what the economy can produce with its resources. Actual output may not rise immediately if demand is weak. Lower wages alone reduce a cost; they do not mean workers produce more per hour.
Judge the results, not just programme size
Relevant skills
A completed course helps only if it builds skills that employers can use. Placements and credible assessment can improve the link.
Complementary constraints
Technology may require skills, finance, energy and infrastructure. Removing one bottleneck may expose another.
Distribution and environment
Some workers bear transition costs and may need support. Faster production can create environmental pressure unless the design accounts for it.
Counterfactual
Ask what investment or training would have occurred anyway. Spending on activities that would happen without support creates little additional benefit.
Worked example: New machines remain unused
A tax incentive encourages firms to buy new technology. Some machines remain unused because staff lack skills and demand is weak. Competing training and transport projects also need funding.
- The tax incentive lowers the cost of buying productive equipment, encouraging investment. But the equipment must be installed and used effectively to improve production.
- Training may be a necessary complement; weak demand can still leave new capacity idle.
- Compare the additional productivity and employment benefits with the public cost. Funding this programme also gives up the benefits of alternative uses, such as the competing training or transport projects.
Watch out for this
A wage cut proves productivity improved.
Productivity is output per unit of input. Lower pay reduces a cost but does not by itself increase output per worker or improve workers' living standards.
Check your understanding
A programme raises potential output but demand is unchanged and weak. What follows?
- Actual output must instantly rise by the full capacity increase.
- There is greater productive capability, but actual production depends on demand and use.
- Potential output cannot change unless demand first rises.