A positive externality or an external benefit that occurs if some of the benefits of the production or consumption of a product spillover into a third party that does not have to pay and even if you don't get vaccinated and others get it first.
While a negative externality or the diseconomy is one that imposes a negative impact and effects on the unrelated third party and due to it imposes the costs to the product and the services of polluting effects.
She knows that the price of the diamond is down. But it will
not stay down forever. Soon the supply will be reduced and the prices will go
up. That’s when she will sell her necklace. And gain profit
