Core Knowledge Revision for Year 13 Edexcel Economics | Year 13 Edexcel 经济：核心知识点梳理

📚 Core Knowledge Revision for Year 13 Edexcel Economics | Year 13 Edexcel 经济：核心知识点梳理

This article provides a comprehensive overview of the core topics for Year 13 Edexcel Economics A, covering business behaviour, market structures, labour markets, market failure, and the global economy. It is designed to help students revise key concepts and prepare for their A-level examinations.

本文全面梳理了 Edexcel A Level 经济 A Year 13 的核心主题，涵盖企业行为、市场结构、劳动力市场、市场失灵以及全球经济，旨在帮助学生复习关键概念，为 A-level 考试做好准备。

1. Business Objectives and Behaviour | 企业目标与行为

Firms do not always aim to maximise profit; alternative objectives include revenue maximisation, sales maximisation, satisficing, and corporate social responsibility (CSR).

企业并不总是以利润最大化为目标；其他目标包括收入最大化、销量最大化、满意化以及企业社会责任（CSR）。

The profit-maximising condition is MC = MR, where marginal cost (MC) equals marginal revenue (MR). In diagrams, this occurs where the MC curve intersects the MR curve from below.

利润最大化条件是 MC = MR，即边际成本等于边际收入。在图形中，这发生在边际成本曲线从下方与边际收入曲线相交之处。

Firms may experience principal-agent problems when owners and managers have different goals, leading to inefficiencies.

当所有者与管理者目标不同时，企业可能出现委托代理问题，导致效率低下。

The divorce of ownership from control in modern corporations can shift the goal from profit to size or revenue growth.

现代公司中所有权与控制权的分离可能使目标从利润转向规模或收入增长。

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2. Perfect Competition | 完全竞争

A perfectly competitive market features many buyers and sellers, homogeneous products, perfect information, and no barriers to entry or exit. Firms are price-takers.

完全竞争市场具有众多买卖双方、同质产品、完全信息、无进入或退出壁垒等特征。企业是价格接受者。

In the short run, a perfectly competitive firm can make supernormal profits or losses, but in the long run, only normal profits are earned as entry and exit adjust supply.

短期内，完全竞争企业可获得超额利润或亏损，但长期内，由于进入与退出调整供给，只能获得正常利润。

The demand curve facing the individual firm is perfectly elastic (horizontal line) at the market price, so average revenue (AR) equals marginal revenue (MR).

单个企业面临的需求曲线为完全弹性（水平线），位于市场价格，因此平均收入 (AR) 等于边际收入 (MR)。

Allocative efficiency (P = MC) and productive efficiency (P = min AC) are achieved in long-run equilibrium.

在长期均衡中实现配置效率 (P = MC) 和生产效率 (P = 最低 AC)。

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3. Monopoly and Price Discrimination | 垄断与价格歧视

A pure monopoly exists when one firm dominates the market with high barriers to entry, allowing it to be a price-maker. Natural monopolies arise due to large economies of scale.

纯粹垄断存在于一家企业主导市场并拥有高进入壁垒时，使其成为价格制定者。自然垄断源于巨大的规模经济。

Monopolies can earn supernormal profits in the long run. They may restrict output and raise prices, leading to a deadweight loss of consumer surplus.

垄断企业可在长期内获得超额利润。它们可能限制产量、提高价格，导致消费者剩余的无谓损失。

Price discrimination occurs when a firm charges different prices for the same product to different consumers, provided it has market power, ability to segment markets, and prevents resale. It transfers consumer surplus to the producer.

价格歧视是指企业对同一产品向不同消费者收取不同价格，条件是拥有市场力量、能够划分市场并防止转售。它将消费者剩余转移给生产者。

Degrees of price discrimination: first-degree (perfect), where each consumer pays their maximum willingness; second-degree, based on quantity; third-degree, based on consumer groups.

价格歧视的程度：一级（完全）价格歧视，每位消费者支付其最高支付意愿；二级价格歧视基于数量；三级价格歧视基于消费者群体。

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4. Monopolistic Competition and Oligopoly | 垄断竞争与寡头垄断

Monopolistic competition combines many firms with product differentiation and no barriers. In the short run, supernormal profits are possible, but in the long run, these are competed away due to entry.

垄断竞争结合了许多企业、产品差异化和无进入壁垒。短期内可能获得超额利润，但长期内因进入而被竞争殆尽。

Oligopoly is a market dominated by a few large firms, characterised by interdependence and strategic behaviour. Game theory, such as the prisoner’s dilemma, illustrates how firms might collude or compete.

寡头垄断是由少数大企业主导的市场，特征为相互依赖和策略性行为。博弈论，如囚徒困境，说明了企业可能合谋或竞争。

The kinked demand curve model explains price rigidity in oligopolistic markets: if a firm raises its price, rivals do not follow, making demand elastic above the kink; if it cuts price, rivals match, making demand inelastic below.

弯折需求曲线模型解释了寡头市场中的价格刚性：若一家企业提价，对手不跟随，弯折以上需求富有弹性；若降价，对手跟进，弯折以下需求缺乏弹性。

Collusion can be tacit or overt, leading to cartel-like outcomes, though such behaviour is often illegal. Competition policy aims to prevent anti-competitive practices.

合谋可以是心照不宣的或公开的，导致类似卡特尔的结果，尽管此类行为通常非法。竞争政策旨在防止反竞争行为。

A comparison of market structures can be summarised in a table:

市场结构比较可汇总于下表：

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