Answer:
Threat of substitute products or services
Explanation:
Threat of substitute products or services is one of the porter's 5 forces, it talks about a product being available for purchase by consumer as a replacement for a substitute product from another industry.
A product is considered a substitute if it offers the same satisfaction consumers gets from it when compared with another product of the same type but from another industry. As stated by Porter's 5 forces "Threat of substitute" helps to give structure to how competition is in an industry.
When there is the availability of threat of substitute for a product, it tends to affect the income of a particular industry that has a substitute to their product as consumers can decide to go for the substitute.