What it means
In economics and finance, public goods have two specific traits: non-rivalry and non-excludability. Non-rivalry means that your use of the good does not stop someone else from using it.
Non-excludability means it is practically impossible to stop people who have not paid from enjoying its benefits. Because of these traits, traditional businesses struggle to sell public goods for a profit.
If customers cannot be stopped from using a product without paying, they have no incentive to buy it. This is often called the free-rider problem, where individuals consume a resource without contributing to the cost of creating or maintaining it.
To ensure these essential resources exist, governments and communities usually fund them through taxes or public grants. Examples include street lighting, national defence, and public parks.
Without public funding, these items would simply not be provided by private markets because companies cannot guarantee a return on their investment. For non-finance managers, understanding public goods helps clarify why certain communal investments are handled outside normal profit-and-loss models.
It explains the economic reasoning behind taxation, community infrastructure projects, and why some resources require collective management to survive. Imagine a street party where someone sets off fireworks in the middle of a neighbourhood.
Anyone sitting in their garden can look up and watch the display for free, and one person watching does not block the view for their neighbour.
In practice
Real-world examples
Example 1
A local tech startup contributes to an open-source software library used by thousands of developers globally. The code is freely available to everyone, regardless of whether they financially support its upkeep. The startup benefits from the library too, but cannot stop a competitor using it for free.
Example 2
A small manufacturing firm benefits from a newly paved public access road leading to its industrial estate. The business pays local taxes, but uses the route daily without extra tolls. Its trucks spend less time on the road and need fewer repairs, yet its tax bill does not rise with each journey.
Example 3
A retail business gains extra foot traffic from a brightly lit public square managed by the local council, which keeps shoppers safe and businesses visible at night without charging shop owners. Late evening trading becomes more attractive. The council funds the lighting from tax revenue, so no shop owner receives an invoice for it.
Think of it
Imagine a street party where someone sets off fireworks in the middle of a neighbourhood. Anyone sitting in their garden can look up and watch the display for free, and one person watching does not block the view for their neighbour.
Formula
Calculation
Net Social Benefit = Total Social Benefit - Total Cost
Public goods do not rely on standard commercial pricing formulas. Instead, economists use cost-benefit analysis to decide if public funding is worthwhile. If Total Social Benefit exceeds Total Cost, the public good is worth funding, even if direct revenue is zero.
Worked example: an open-source software library costs $200,000 a year to maintain. If 4,000 companies each gain $150 of value a year from using it, the total social benefit is 4,000 x $150 = $600,000. Net social benefit is $600,000 - $200,000 = $400,000, so funding it from grants or shared contributions is clearly worthwhile, even though nobody pays a price per use.Case study
Seen in the real world
This is a fictional, illustrative scenario. Brighton Beacon, a medium-sized manufacturing firm, operated in an industrial park with crumbling roads and poor street lighting. Deliveries were frequently delayed, and employee safety was a concern at night. The local council lacked funds to fix the area, so five businesses in the estate formed a cooperative. They pooled $30,000 each, a total of $150,000, to upgrade the roads and install solar lighting across the whole estate.
Because these improvements were open to all visitors and delivery drivers without a gate or toll, they acted as local public goods. The firms could not charge other businesses for using the road, but the shared investment reduced vehicle repair costs, cut delivery delays by 20%, and improved staff retention. Each of the five firms estimated a saving of about $12,000 a year, a combined $60,000, so the $150,000 outlay paid back in 2.5 years. A sixth business nearby gained the same benefits without paying anything, a clear example of the free-rider problem. By treating the local infrastructure as a shared public good, Brighton Beacon solved a collective action problem that individual budgeting could not address.
Watch out
Common mistakes
- Assuming any product provided by the government is automatically a public good.
- Believing that public goods are always completely free to produce and maintain.
- Confusing non-excludable public goods with charitable donations.
Questions
People also ask
Are public goods always provided by the government?
Not always. While governments provide most public goods using tax revenue, communities, charities, and sometimes private companies can also fund them if the benefits justify the cost.
What is the free-rider problem?
It occurs when people benefit from a resource without paying for it, making it difficult for private businesses to make a profit selling that resource.
Is healthcare a public good?
Strictly speaking, no. Healthcare is usually a private or club good because doctors can treat a limited number of patients, and access can be restricted to those who pay.