Game theory and strategic choice — Economics, 14–17
Some choices depend on what other people are likely to do. Game theory maps these situations, showing why individually sensible actions can produce a poor result for everyone.
Your choice changes with theirs
A strategic choice is one where your result depends on another person’s choice as well as your own. You try to predict their action, while knowing they are predicting yours. Game theory uses players, options and outcomes to make this interaction easier to examine.
Why study strategy?
Economic models once often treated decisions as separate, but firms, governments and households react to one another. A company cutting its price may start a price war; a country’s action may change another’s plan. Game theory was developed to study these linked decisions rather than isolated ones.
Two shops choose prices
Two shops can charge €10 or €8. If both charge €10, each earns €100; if both charge €8, each earns €80. If one charges €8 while the other charges €10, the cheaper shop earns €120 and the other €50. Each shop has a reason to cut its price, even though both would prefer the €100 outcome.
The best move alone
A common mistake is to choose the action with the best payoff in one imagined situation. That seems reasonable because you can control your own move, not the other player’s. But the other player reacts, so compare outcomes across their possible choices. A good strategy considers the whole interaction.
Negotiating and competing
Strategic thinking appears when two companies set prices, countries negotiate emissions, or you and a friend divide a shared task. It can suggest cooperation, a credible promise or a compromise. It does not predict people perfectly: trust, fairness and missing information also matter.
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