What this lesson teaches
I can explain how taxes, subsidies, quotas, tradeable permits, provision, rules and public education correct market failure.
Syllabus 9570, 2.3.3(b). Microeconomic Policies: Policy measures including taxes and subsidies, quotas and tradeable permits, joint and direct provision, rules and regulations, public education in achieving efficiency and equity
Make a guess
A factory knowingly dumps waste into a river. Would a clear label about the damage stop it?
- Yes, if the label is big enough for everyone to see it.
- Yes, because a clear label makes the factory see how much harm it does.
- No. It knows the harm, so it needs a limit or tax.
Show the answer
No. It knows the harm, so it needs a limit or tax.
The cause is a negative externality, not missing information. Labels help when buyers misjudge their own benefit, not when a firm ignores others.
Rules set limits on harmful behaviour; education and labels fix information failure.
Regulation uses rules: bans, limits, standards and required disclosures. Singapore bans vaping, sets the minimum age for buying tobacco at 21, and sets limits on factory emissions.
Rules act directly and are easy to understand, but they need enforcement, and bans can lead to black markets.
Public education and labelling address information failure by telling people the true costs or benefits. Nutri-Grade labels on drinks are an example.
Education works slowly, and some people ignore it, so it is often combined with taxes or rules.
- Rules
- Bans, limits, standards; need enforcement.
- Education
- Fixes information failure; slow.
Worked example: A label and a pollution limit
Consumers misjudge the sugar in drinks. Separately, a factory dumps waste into a river even though it knows the damage.
- The drinks problem is information failure, so a clear label is a good fit.
- The factory problem is a negative externality, not a lack of information.
- A label would not stop the factory; a legal limit on its waste, or a tax, would.
- Match the policy to the cause of the failure.
Watch out for this
A ban is always the most effective policy.
Bans need enforcement and can create black markets. They also remove any benefits from units worth producing.
Check your understanding
Which policy best fits a problem of consumers not knowing how much sugar is in drinks?
- A ban on all sugary drinks.
- Clear nutrition labels.
- A subsidy for drink producers.
Show the answer
Clear nutrition labels.
Right. The cause is information failure, so better information addresses it directly.