These are all examples of externalities. Sorry, if this sounds too complicated at the beginning, it will all make sense as you read along. Externalities can happen when the after-effects of certain actions can spill over to other people not directly involved in it. These could be either positive or negative spillovers.
Externalities can arise between producers, between consumers or between consumers and producers. Externalities can be negative when the action of one party imposes costs on another, or positive when the action of one party benefits another.
Let’s look at an example of a positive externality. Vaccination for any infectious disease would be a positive externality because vaccination will reduce the overall severity, symptoms, and thus the possibility of spread of infection of that particular disease. This will also benefit people who are not vaccinated through positive spill overs by others who are. People who didn’t receive the vaccine are less likely to get an infection if more and more people around them are vaccinated. Vaccination also reduces the burden on a country’s healthcare and benefits society. Most recent example of this is the Covid 19 vaccine, which was provided mainly by the government in many countries to stop the spread of infection.
In both positive or negative externalities, government intervention is required to make sure the businesses that create externalities get the benefits for positive externalities or pay the price for negative externalities.
If a factory is producing toys but at the same time polluting the environment, people are bearing the cost of pollution. This is a negative externality. From an economic perspective, the business is transferring some of its cost of production to society. Without any tax on pollution, that business factory’s actual cost of production is less than what it should be, so it can charge lower prices from the people for the toys it produces. This reduced price creates more demand for toys, making the business produce more and more toys and thus polluting the air more.
In our first example above, the factory will find ways to reduce its chimney smoke from polluting air if it has to pay the price for its pollution. Government can impose taxes in these cases. Tax will also increase the overall cost of production for the business. The business will be forced to charge higher prices from the consumers, which will, in turn, reduce the demand for it and the over-pollution problem will be solved to some extent. Similarly, water pollution that is caused by industrial effluents can harm ocean life, other plants, animals, and humans. The government imposing a tax on factories creating water pollution can limit it to some extent. In economics, the use of tax to limit negative spillovers is known as internalizing the externality.
Another type of negative externality is caused by smoking. The government wants to discourage smoking and thus impose heavy duties and taxes on cigarette manufacturers because active or passive smoking both are harmful to society. Thus, cigarettes sell at a fairly expensive price. People who can’t afford to buy can refrain from consuming it. Also, smoking is banned in public places and to minors, these are all attempts to reduce the consumption of smoke.
Similarly, to encourage businesses with positive externalities, government can provide subsidies to those producers. When producers get subsidy it lowers their cost of production and it encourages them to produce more. Also, the subsidy is a government expenditure, which government meets through taxation on general public. This taxation on general public is either form of direct tax (like income tax) or indirect taxes (like those paid on goods and services when we buy them.) Thus, the society who is reaping the fruits of a positive externalities ultimately ends up paying the price of subsidy.
One example of this is public (government funded) education, when the government subsidizes public education, a greater quantity of education (more schools and colleges) is made and the society as a whole reaps the spillover benefits of more educated people. Also, parks, the police force, and public hospitals provided by the government provide benefits to any person who lives in the neighborhood. These are called public goods with positive externalities that are nonexcludable and benefit the larger public who indirectly pay for them through taxation.
