There are two producers of water heaters that together are the sole providers to a large community. The executives of these companies meet to set minimum prices and production levels. By doing so, they ensure that they each will make a higher profit than they would in a free market. This is an example of a Duopoly
Explanation:
Duopoly is a kind of Oligopoly where a market is dominated only by few producers. In this case it is dominated by two producers hence it is duopoly. It means that these two producers only influence the market. They maintain a mutual relationship with each other and they powerfully dominate the industry.
It is marketed in a way that the computers are let to choose between either of these two products. To quote as an example we can take Apple and Android which works hand in hand. Price fixing is the important tool that they use to catch the market which will be difficult for a small firm producer to opt for.