两家竞争厂商各自计划推出一种新产品。每家厂商将决定是否生产产品A、产品B或产品C。它们将同时作

(1)是否存在纯策略的纳什均衡？如果存在，请指出。

(2)如果两厂商都采用极大化极小策略，结果会怎样？

(3)如果厂商1采用极大化极小策略，厂商2得知后，它会怎样做？

Two competing firms are each planning to introduce a new product. Each firm will decide whether to produce Product A, Product B, or Product C. They will make their choices at the same time. The resulting payoffs are shown below.

We are given the following payoff matrix，which describes a product introduction game:

a, Are there any Nash equilateral in pure strategies？ If so, what are they？

b. If both firms use maximin strategies, what outcome will result？

c. If Firm 1 uses a maximin strategy，and Firm 2 knows, what will Firm 2 do？