📚 Year 8 CCEA Business: Formula & Principle Quick Reference Guide | Year 8 CCEA 商务：公式定理速查手册
This quick reference guide brings together the essential formulas and key principles you will encounter in the Year 8 CCEA Business Studies course. Use it to simplify revision, check understanding, and build confidence when tackling calculations and explaining fundamental concepts.
这本速查手册汇集了 Year 8 CCEA 商务课程中必须掌握的核心公式与关键定理。你可以用它来简化复习、检验理解，并在处理计算和解释基本概念时增强信心。
1. Law of Demand | 需求定律
The law of demand states that when the price of a good or service increases, the quantity demanded decreases, and when the price falls, the quantity demanded increases, provided all other factors stay the same (ceteris paribus).
需求定律指出，在其他条件不变的前提下，当商品或服务的价格上升时，需求量会下降；而当价格下降时，需求量则会上升。
This inverse relationship can be expressed simply as: Price ↑ → Quantity Demanded ↓
这种反向关系可以简单表示为：价格 ↑ → 需求量 ↓
2. Law of Supply | 供给定律
The law of supply states that, ceteris paribus, as the price of a good or service increases, the quantity supplied increases, and as the price falls, the quantity supplied decreases. Producers are more willing to supply goods when prices are higher.
供给定律指出，在其他条件不变的情况下，当商品或服务的价格上升时，供给量增加；当价格下降时，供给量减少。价格越高，生产者越愿意提供商品。
The positive relationship can be summarised as: Price ↑ → Quantity Supplied ↑
这种正向关系可以概括为：价格 ↑ → 供给量 ↑
3. Opportunity Cost | 机会成本
Opportunity cost refers to the value of the next best alternative that is forgone when a choice is made. It is the cost of what you give up in order to do or have something else.
机会成本是指做出某一选择时所放弃的次优选项的价值。它就是为得到某样东西而必须放弃的东西的成本。
For example, if a student spends one hour studying business instead of playing sport, the opportunity cost is the enjoyment and benefit they would have gained from playing sport.
例如，如果一名学生花一小时学习商务而不是运动，那么机会成本就是他从运动中本可获得的享受和益处。
4. Total Revenue Formula | 总收入公式
Total revenue is the money a business receives from selling its goods or services. It does not take costs into account and is often called sales revenue or turnover.
总收入是企业通过销售商品或服务获得的款项。它不考虑成本，通常也被称为销售收入或营业额。
The formula is: Total Revenue = Selling Price × Quantity Sold
其计算公式为：总收入 = 销售单价 × 销售数量
5. Total Cost Formula | 总成本公式
Total cost is the sum of all expenses a business incurs in producing goods or providing services. It combines costs that stay the same regardless of output (fixed costs) and costs that change with production (variable costs).
总成本是企业在生产商品或提供服务时发生的全部费用之和。它包括不随产量变化的固定成本以及随产量变化的可变成本。
The formula is: Total Cost = Fixed Costs + Variable Costs
公式为：总成本 = 固定成本 + 可变成本
6. Profit Formula | 利润公式
Profit is the positive difference between total revenue and total cost. It rewards the entrepreneur for taking risks and running the business. If costs exceed revenue, the business makes a loss.
利润是总收入与总成本之间的正差额。它是对企业家承担风险、经营企业的回报。如果成本超过收入，企业则发生亏损。
The fundamental profit equation is: Profit = Total Revenue − Total Cost
基本的利润等式为：利润 = 总收入 − 总成本
7. Break-Even Point Formula | 盈亏平衡点公式
The break-even point is the number of units a business must sell so that total revenue exactly equals total cost, resulting in neither profit nor loss. It helps businesses set sales targets.
盈亏平衡点是指企业必须销售的产品单位数，使得总收入恰好等于总成本，企业既不盈利也不亏损。它帮助企业设定销售目标。
Break-Even Point (units) = Fixed Costs ÷ (Selling Price − Variable Cost per Unit)
盈亏平衡点（单位） = 固定成本 ÷（销售单价 − 单位可变成本）
8. Profit Margin | 利润率公式
Profit margin tells us what percentage of total revenue remains as profit after all costs have been paid. A higher profit margin usually signals better cost control or stronger pricing power.
利润率表示在支付所有成本后，总收入中有多大比例留为利润。利润率越高，通常说明成本控制越好或定价能力越强。
Profit Margin (%) = (Profit ÷ Total Revenue) × 100
利润率（%） =（利润 ÷ 总收入）× 100
9. Working Capital | 营运资金公式
Working capital measures a business’s ability to meet its short-term obligations. It shows whether current assets are enough to cover current liabilities. Positive working capital suggests good liquidity.
营运资金衡量企业偿还短期债务的能力。它说明流动资产是否足以支付流动负债。正的营运资金表示企业流动性较好。
Working Capital = Current Assets − Current Liabilities
营运资金 = 流动资产 − 流动负债
10. Market Share Formula | 市场份额公式
Market share shows the portion of total market sales a particular business has achieved. It is a key indicator of competitiveness and is often expressed as a percentage.
市场份额表示某个企业的销售额在行业总销售额中所占的比例。它是衡量竞争力的重要指标，通常用百分比表示。
Market Share (%) = (Business’s Sales ÷ Total Market Sales) × 100
市场份额（%） =（企业销售额 ÷ 市场总销售额）× 100
11. The Marketing Mix (4Ps) | 营销组合定理
The marketing mix is a fundamental business principle that identifies four key elements a company uses to market its products effectively. These are known as the “4Ps”: Product, Price, Place, and Promotion. Getting the mix right helps satisfy customers and achieve business goals.
营销组合是一项基本商业定理，指出企业用以有效营销产品的四大关键要素，即 “4P”：产品（Product）、价格（Price）、渠道（Place）和促销（Promotion）。组合得当有助于满足顾客并实现企业目标。
Product refers to the good or service meeting customer needs; price is the amount charged; place covers distribution channels; and promotion involves advertising, sales offers and public relations.
产品是指满足顾客需求的商品或服务；价格是收取的金额；渠道涵盖分销通路；促销则包括广告、销售优惠和公共关系。
12. Factors of Production | 生产要素定理
The factors of production are the resources required to produce goods and services. This principle classifies them into four categories: Land, Labour, Capital, and Enterprise. Every business uses a combination of these to create value.
生产要素是生产商品和服务所必需的资源。该定理将它们分为四类：土地、劳动、资本和企业才能。任何企业都利用这四者的组合来创造价值。
Land includes natural resources; labour is human effort; capital covers machinery, tools and buildings; enterprise refers to the willingness to take risks and organise the other three factors.
土地包括自然资源；劳动指人力付出；资本涵盖机器、工具和建筑；企业才能则指承担风险、组织其他三种要素的意愿。
Published by TutorHao | Business Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导