Answer: Cutthroat competition
Explanation:
The cutthroat competition is basically refers to the competitive action that is used for illustrating the various types of laws and regulations for the purpose of consumer protection and the law for the purpose of enforcement the given competitive action.
According to the given scenario, the demand of the fast food are decline now a days as the customers are focuses on healthy diet and the demand are basically shifted towards towards to other alternatives.
Therefore, The given competitive action is basically indicating the cutthroat competition for the purpose of eliminating various types of things by using the destructive action.
Therefore, Cutthroat competition is the correct answer.