Firms and Industries | 企业与产业

📚 Firms and Industries | 企业与产业

Firms are the basic production units in an economy; an industry is a group of firms producing similar products or services. Understanding how firms are classified, grow, and interact within industries is central to Cambridge A-Level Economics, especially for analysing costs, market power, and efficiency.

企业是经济中基本的生产单位；产业则是生产相似产品或服务的一组企业。理解企业如何分类、成长以及在产业内相互作用，是剑桥 A-Level 经济学的核心内容，尤其有助于分析成本、市场势力与效率。

1. Defining Firms and Industries | 企业与产业的定义

A firm is an economic unit that employs factors of production (land, labour, capital, enterprise) to produce goods or services. Firms range from sole traders to multinational corporations, but all aim to combine inputs efficiently to generate output.

企业是使用生产要素（土地、劳动、资本、企业家才能）生产商品或服务的经济单位。企业从个体经营者到跨国公司不等，但都旨在有效组合投入以创造产出。

An industry is a collection of firms producing products that are close substitutes, such as the airline industry or the smartphone industry. The definition of an industry affects how economists measure competition, concentration, and market power.

产业是生产相近替代品的企业集合，例如航空业或智能手机业。产业的定义会影响经济学家衡量竞争、集中度和市场势力的方式。

2. Classifying Production: Primary, Secondary, Tertiary | 生产分类：第一、第二、第三产业

Economists classify production into primary, secondary, and tertiary sectors. Primary industries extract raw materials directly from nature. Secondary industries transform raw materials into finished or semi-finished goods. Tertiary industries provide services rather than physical goods.

经济学家将生产分为第一、第二和第三产业。第一产业直接从自然界获取原材料；第二产业将原材料转化为制成品或半制成品；第三产业提供服务而非实物商品。

• Primary: agriculture, fishing, mining, forestry, oil extraction | 第一产业：农业、渔业、采矿、林业、石油开采
• Secondary: car manufacturing, food processing, construction, electricity generation | 第二产业：汽车制造、食品加工、建筑、发电
• Tertiary: retail, banking, education, transport, tourism | 第三产业：零售、银行、教育、运输、旅游

Some textbooks add a quaternary sector for knowledge-based services such as IT and research, but the three-sector model remains the core classification in Cambridge A-Level Economics.

一些教材会增加第四产业来涵盖 IT 和研究等知识型服务，但三部门模型仍是剑桥 A-Level 经济学的核心分类。

3. Private Sector and Public Sector | 私营部门与公共部门

In a mixed economy, firms operate in either the private sector or the public sector. Private sector firms are owned by individuals, families, or shareholders and usually pursue profit maximisation. Public sector organisations are owned and controlled by the government and often provide goods or services with positive externalities or public good characteristics.

在混合经济中，企业经营于私营部门或公共部门。私营部门企业由个人、家庭或股东所有，通常追求利润最大化。公共部门组织由政府拥有和控制，通常提供具有正外部性或公共品特征的商品或服务。

Governments may transfer firms between sectors. Privatisation sells

Published by TutorHao | A-Level Economics Revision Series | aleveler.com

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