One of the most important skills in A-Level Economics is being able to explain how one economic change leads to another. Students often know the beginning of an argument and they know the conclusion. The difficulty is explaining what happens in between.
Take interest rates. Most economics students quickly learn that higher interest rates can help to reduce inflation. But this:
Higher interest rates → lower inflation
is not really analysis. It gives you the starting point and the destination, but it doesn't explain the journey. A better answer explains the mechanism connecting them.
The Arrow Test
A useful way to think about analysis is to imagine that every economic argument consists of a series of arrows. For example:
Bank Rate rises → borrowing becomes more expensive → consumption and investment fall → aggregate demand falls → inflationary pressure falls
Each arrow represents a claim about cause and effect, and every arrow can be tested with one simple question:
Why should this arrow work?
Take the first connection:
Bank Rate rises → borrowing becomes more expensive
Why? Because commercial banks will normally raise at least some of the interest rates they charge households and firms.
Then:
Borrowing becomes more expensive → consumption and investment fall
Why? Higher borrowing costs may discourage households from financing major purchases and make some investment projects less profitable for firms. Higher interest rates may also increase mortgage payments for some households, reducing the disposable income available for other spending.
Then:
Consumption and investment fall → aggregate demand falls
Why? Because consumption and investment are both components of aggregate demand.
Now we are doing analysis. This is what I call the Arrow Test:
If you write A → B, you are making a claim. Ask: why should this arrow work?
If you cannot answer that question, there may be a missing step in your reasoning — or the connection itself may be wrong.
Start With the Beginning and the End
When faced with an economics question, it often helps to identify two things first: Where am I starting? and Where am I trying to get to?
Suppose the question asks you to explain how an increase in Bank Rate could reduce inflation. Your starting point is:
Bank Rate rises
Your destination is:
Inflationary pressure falls
So initially you have:
Bank Rate rises → ? → ? → ? → inflationary pressure falls
Now ask: Then what?
Bank Rate rises. Then what? Borrowing becomes more expensive and saving may become more attractive. Then what? Households may reduce consumption and firms may reduce investment. Then what? Aggregate demand falls. Then what? There is less upward pressure on the general price level.
You have filled in the missing middle.
Find the Missing Middle
This is often where the marks are. Students frequently jump from a policy or economic event directly to its final effect.
For example:
Government subsidy for electric cars → more electric cars purchased
That may be correct, but it skips the mechanism. A more developed chain might be:
Government subsidy → lower effective purchase price → higher quantity demanded → more electric cars purchased
Now apply the Arrow Test. Why should a lower price increase quantity demanded? Because, other things being equal, a fall in price causes an extension along the demand curve.
The same problem appears throughout economics. Depreciation of sterling → exports increase, higher productivity → economic growth increases and higher minimum wage → unemployment increases may all conceal important missing steps or assumptions. Whenever a conclusion seems to arrive too quickly, ask: What has to happen between these two statements?
But a Long Chain Can Still Be Wrong
Adding more arrows does not automatically create better analysis. Consider:
Corporation tax rises → firms' costs rise → prices rise → demand falls → profits fall → investment falls → economic growth falls
It certainly looks developed, but there is a problem near the beginning. Corporation tax is charged on profits. It is not normally a cost of producing one additional unit of output in the same way as wages, energy or raw materials.
A better argument might examine how a higher corporation-tax rate affects the post-tax return from investment, and whether that changes firms' incentives to invest in the UK. Good analysis is not created by adding arrows: a short chain can be correct and a long chain can be wrong. What matters is whether the connections make economic sense.
Depth Before Breadth
Another common problem is trying to tell the examiner everything you know. Suppose a question asks about higher interest rates and a student writes:
Higher interest rates reduce consumption, increase saving, reduce investment, strengthen the exchange rate, reduce exports and therefore reduce inflation.
There is plenty of economics in that sentence, but several different mechanisms have been bundled together without any of them being properly explained. It would often be better to take one route and develop it:
Higher interest rates → borrowing becomes more expensive → some households reduce consumption → aggregate demand falls → demand-pull inflationary pressure weakens
You can develop another route if the question and the marks available justify it. But I would rather see one mechanism explained properly than five possible effects mentioned in passing. Depth before breadth is a useful rule of thumb for analysis.
Precise Terminology Matters
A chain can also go wrong because the terminology is imprecise. For example:
Price rises → demand falls
In everyday language that sounds perfectly reasonable, but in economics it is normally incorrect. If the price of the good itself rises, there is a movement along the demand curve and quantity demanded falls. Demand itself has not shifted.
A change in demand means that the entire demand curve has moved because a non-price determinant of demand has changed. These distinctions matter because if one link describes the wrong economic event, the reasoning that follows can go wrong too.
Test the Arrow, Then Challenge It
The Arrow Test does something else useful: it provides a natural bridge from analysis to evaluation. Suppose you write:
Sterling depreciates → UK exports become cheaper overseas → demand for UK exports rises → net exports rise → aggregate demand rises → real GDP rises
First, test each arrow. Why do UK exports become cheaper to overseas buyers? Why should a lower foreign-currency price increase demand? Why should higher export demand increase aggregate demand? Why should higher aggregate demand increase real GDP?
That is analysis. Now turn the questions around and ask: How strong is each arrow?
Will demand for exports rise very much if demand is price inelastic? What if UK firms cannot increase production quickly enough to meet additional overseas demand? What if higher import prices raise firms' costs at the same time? What if the economy is already operating close to full capacity?
Now you are evaluating the mechanism rather than merely describing it. This also explains why good economics is often conditional. Expectations matter, elasticities matter, the state of the economy matters and time matters. Words such as may, might and could are therefore useful, provided you explain the reason for the uncertainty rather than using them as an escape from making an argument.
Time can be particularly important because economic relationships may work differently depending on whether we are considering the short run or the long run. See How to Use the Short Run and Long Run in A-Level Economics.
Diagrams Should Be Part of the Chain
A diagram should not sit beside your analysis as a separate piece of economics. It should help explain the mechanism.
Suppose you are analysing an indirect tax. You might reason:
Indirect tax → firms' costs of supplying the product increase → supply shifts left → equilibrium price rises and equilibrium quantity falls
The supply-and-demand diagram shows part of that chain visually. You can then use the diagram in your written analysis: the tax increases firms' costs of supplying the product, shifting the supply curve to the left. This raises the equilibrium price and reduces the equilibrium quantity, other things being equal.
The diagram and the written analysis are doing the same job: explaining the mechanism.
Context Should Be Part of the Chain Too
The same principle applies to context. Don't simply attach a statistic or fact from an extract to your paragraph; ask why that information changes the mechanism you are describing.
Suppose an extract tells you that a large proportion of households have mortgages and many will soon need to refinance. That could strengthen a chain involving interest rates:
Bank Rate rises → mortgage rates rise → refinancing households face higher repayments → disposable income falls → consumption falls
The context has not merely been mentioned. It has become part of the economic reasoning. I look at this in more detail in How to Use Context Properly in A-Level Economics.
Think in Mechanisms, Not Memorised Paragraphs
Chains of analysis aren't really an exam trick. They are economic mechanisms: explanations of how something works.
Once you understand the mechanism, you don't need to remember a paragraph word for word. You can reconstruct the argument when the question, policy or context changes. That is much more useful than memorising dozens of model answers.
There Is No Magic Number of Links
Students are sometimes taught that a good chain of analysis needs a particular number of links. I wouldn't think about it that way. There is no economic reason why every mechanism should contain exactly the same number of stages.
A chain is too short when you have jumped over something that needs explaining. It is too long when you add meaningless steps merely to make it look developed. Compare:
Interest rates rise → inflation falls
with:
Interest rates rise → borrowing becomes more expensive → consumption and investment may fall → aggregate demand falls → demand-pull inflationary pressure weakens
The second is better not because it contains a particular number of arrows, but because it explains the mechanism.
Fewer arrows. Better reasoning.
From Analysis to Evaluation
Once you can see the chain clearly, evaluation becomes easier. Analysis asks: Why should each arrow work? Evaluation asks: Which arrow might be weaker than I have assumed, and why?
That gives you a simple progression:
Build the chain → test the chain → challenge the chain
I develop that next step in How to Evaluate in A-Level Economics.
A Worked Example: A Tax on Sugary Drinks
Suppose the question asks you to analyse how a tax on sugary drinks could reduce their consumption. Start with the beginning and end:
Tax introduced → ? → ? → consumption falls
Now fill in the missing middle:
Tax introduced → firms' costs of supplying the product increase → supply shifts left → market price rises → quantity demanded falls → consumption falls
Apply the Arrow Test. Why might firms' costs rise? Because the tax increases the cost associated with selling the taxed product. Why might the market price rise? Because the tax shifts the supply curve to the left, creating a new equilibrium at a higher price, assuming some of the tax is passed on to consumers. Why should quantity demanded fall? Because a higher price causes a contraction along the demand curve, other things being equal.
Now challenge the chain. What if demand is very price inelastic? The higher price may produce only a small reduction in quantity demanded. What if firms absorb much of the tax through lower profit margins rather than passing it on? The increase in the consumer price may be smaller. And what if consumers switch to other high-sugar products that are not covered by the tax? The effect on overall sugar consumption may then be smaller than the effect on sales of the taxed drinks.
The same chain has now generated both analysis and evaluation. Notice, though, that thinking through every link does not mean writing every thought down in the exam. The Arrow Test is a planning tool as much as a writing technique: once you have checked the mechanism, you can often express it accurately in two or three sentences. The aim isn't to make your answers enormous; it is to make them reliable.
How I Would Practise This
You don't need to write full essays every time you practise analysis. Take a few simple relationships such as:
Depreciation of sterling → inflation
Higher minimum wage → employment
Subsidy for public transport → car use
Higher productivity → economic growth
Put the starting point at one end of a piece of paper and the destination at the other, then fill in the middle. Apply the Arrow Test to every connection:
Why? → Then what? → So what?
Have you jumped over anything? Is your terminology precise? Are you assuming something happens automatically when it may depend on the circumstances? Which link is weakest?
Only then turn the chain into prose. With practice, you start doing this almost automatically.
The Bigger Idea
The phrase chain of analysis makes the skill sound rather technical. At heart, you are explaining cause and effect.
Something changes. That alters costs, incentives, income, expectations or behaviour. People and firms respond, and those responses affect markets or the wider economy. Your job is to make that route visible.
Know where you are starting and know where you need to finish. Fill in the important steps between them, then apply the Arrow Test:
Why should this arrow work?
Once you can do that, turn the question around:
When might this arrow be weaker than I have assumed?
That is where analysis begins to become evaluation. See How to Evaluate in A-Level Economics for the next step, followed by How to Reach a Judgement in A-Level Economics.
The aim isn't to memorise the largest possible collection of economic chains. It is to understand enough economics to build them yourself. Knowledge gives you the building blocks. Understanding shows you how they connect.