Answer:
The study of decision making in situations where strategic interaction occurs between rivals.
Step-by-step explanation:
Game theory looks at the interactions between participants in a competitive game and calculates the best choice for the player.
Game theory is usually practiced by firms in an oligopoly
An Oligopoly is when there are few large firms operating in an industry. While, a monopoly is when there is only one firm operating in an industry.
Oligopolies are characterised by:
price setting firms
product differentiation
profit maximisation
high barriers to entry or exit of firms
downward sloping demand curve