Unit 3: Business Behaviour develops the content of Unit 1 and examines how pricing and the nature of competition between firms are affected by the number and size of market participants. At the end of this unit, students should be able to analyse and evaluate the pricing and output decisions of firms in different contexts and understand the role of competition in business decision-making. They should also be capable of making an appraisal of government intervention aimed at promoting competitive markets.

第 3 单元：商业行为发展了第 1 单元的内容，并研究了定价和公司之间竞争的性质如何受到市场参与者的数量和规模的影响。 在本单元结束时，学生应该能够分析和评估企业在不同背景下的定价和产出决策，并理解竞争在商业决策中的作用。 他们还应该能够评估旨在促进竞争市场的政府干预。

• The firm and its objectives 企业和它的目标
• Revenue, costs and profit 收入, 成本和利润
• Market structures and contestability 市场结构和竞争性
• Government intervention to promote competition 政府干预促进竞争