市场营销（A Level）

Marketing analysis 营销分析 means using data to understand the market and to make better marketing decisions. At A Level you study some numbers tools: sales forecasting, time-series analysis, correlation, and elasticity.

Sales forecasting 销售预测 is predicting future sales from past data and market knowledge. Good forecasts help a firm plan production, staff, stock and cash.

Time-series analysis 时间序列分析 studies past sales recorded over time to find a pattern. It has two main parts:

• the trend 趋势 — the general direction of sales over the long run (up, down or flat).
• the seasonal variation 季节性波动 — the regular rise and fall within a year (e.g. ice cream sells more in summer).

To find the trend, firms use a moving average 移动平均, which smooths the ups and downs by averaging several periods in a row. The seasonal variation is then how far the actual figure sits above or below the trend:

A forecast extends the trend into the future (called extrapolation 外推) and then adds the usual seasonal variation. This works only if past patterns continue, so forecasts are never certain.

Correlation 相关性 measures how strongly two things move together — for example, advertising spending and sales.

• positive correlation 正相关 — when one rises, the other rises too.
• negative correlation 负相关 — when one rises, the other falls.

Strong correlation helps a firm predict, but it does not prove that one thing causes the other. Other factors may be at work.

Elasticity 弹性 measures how much demand reacts to a change. Three types guide marketing decisions.

• price elasticity of demand 需求价格弹性 (PED) — for a price elastic 富有弹性 product, cutting the price raises total revenue; for a price inelastic 缺乏弹性 product, raising the price raises total revenue.
• income elasticity of demand 需求收入弹性 (YED) — tells a firm how sales will change as incomes rise or fall, which helps plan for booms and recessions.
• cross elasticity of demand 需求交叉弹性 (XED) — tells a firm how a rival's price change, or the price of a partner product, will affect its own sales.

So elasticity helps a firm set prices, choose products, and predict the effect of a competitor's move.

Worked example. Quarterly sales run Q1 100, Q2 140, Q3 180, Q4 120, then next Q1 108. Find the four-quarter moving-average trend centred on Q3, and the seasonal variation for Q3. Average the first four quarters: $(100 + 140 + 180 + 120) \div 4 = 135$. Average the next four: $(140 + 180 + 120 + 108) \div 4 = 137$. A four-period average falls between quarters, so centre the two: $(135 + 137) \div 2 = 136$, the trend at Q3. The seasonal variation is actual minus trend: $180 - 136 =$ +44, so Q3 runs about 44 units above trend, and next year's Q3 forecast is the projected trend plus 44. The centring step is the one most answers drop: with an even number of periods the average lands between two quarters and must be centred before it can be compared with an actual figure.

A marketing strategy 营销战略 is the long-term plan for how marketing will meet the firm's objectives. Marketing planning 营销规划 is the work of setting that plan: studying the market, choosing target customers, and deciding the marketing mix. Two tools shape strategy: Ansoff's matrix and product portfolio analysis.

Ansoff's matrix 安索夫矩阵 shows four ways to grow, by mixing existing or new products with existing or new markets. The risk rises as you move away from what you know.

Market penetration is the safest; diversification is the riskiest because both the product and the market are new.

Product portfolio analysis 产品组合分析 looks at the firm's whole range of products together, using a tool like the Boston Matrix. It checks the balance: a firm needs some steady earners to fund its risky new products. The aim is a healthy mix, so the firm is not left with only ageing products.

To grow, many firms sell abroad. Globalisation 全球化 (the world becoming more connected) has made this easier. A firm can enter a new country by exporting 出口, by setting up a joint venture 合资企业 with a local partner, or by opening its own branch there.

But a strategy that works at home may need changes. Localisation 本地化 means adapting the marketing mix to the new market — for example, changing the product, the language, the price, or the way it is sold to suit local tastes, laws and incomes.

• Read time-series data: separate the underlying trend from seasonal variation, and extrapolate with caution.
• Interpret correlation (strength and direction) but never assume it proves causation.
• Use Ansoff's matrix to classify a growth strategy and judge its risk (diversification is riskiest).
• Use elasticity values to justify a pricing or promotion decision numerically.

Vocabulary card meanings

marketing analysis: Using market data to judge products, buyers and rivals. time-series analysis: Studying figures over time to find trend, seasonal and random movements. seasonal variation: A regular rise or fall that repeats at the same time each year. product portfolio analysis: Judging the mix of products a firm sells, often with a share-growth grid.