Economics Data-Response Questions: From Table to Answer

You read a table. Exports have increased. Inflation has fallen. Government spending is higher. So far, everything seems straightforward.

Then the question asks you to calculate the change and comment on it. Suddenly, small choices matter. Which figure goes in the denominator? Does lower inflation mean lower prices? Can a bigger spending allocation have a smaller share of the budget?

A good Economics data-response answer connects the evidence, the calculation, and the economic meaning. You do not need a long paragraph for every question. You need to say exactly what the figures allow you to say.

This guide builds that habit through original examples. All numerical datasets below are hypothetical practice data, not current statistics or reproduced examination questions.

1. Read the question before trying to explain the whole table

A table may contain enough information for ten observations. Your question may ask for just one.

Underline the action word and identify the relevant years, categories, or variables.

• Identify or state: give the requested item or value, with its unit.
• Calculate: show the relationship used, substitute the figures, and give the result.
• Compare: make a direct statement about both items on a common basis.
• Explain: connect the evidence to an economic concept or mechanism.
• Comment or infer: state what follows from the figures, with a relevant qualification if needed.
• Justify or evaluate: assess the claim using both the data and the economic reasoning it requires.

These are practical writing habits, not a universal marking scheme. Follow the wording, marks, and instructions of the particular question.

Suppose exports rise from Rs 240 crore to Rs 300 crore. If asked for the absolute increase, the answer is Rs 60 crore. If asked for percentage growth, it is 25%. If asked whether the trade deficit narrowed, exports alone cannot settle the question. You also need imports.

The last case is a useful reminder: sometimes a careful answer identifies missing information rather than inventing it.

2. Give the table a quick identity check

Before doing arithmetic, establish what each number represents.

Read the title and coverage. Does the table describe a country, a state, surveyed households, or one firm? A finding about 30 surveyed households is not automatically a national finding.

Read the units. A figure of 75 could mean Rs 75 crore, 75 lakh people, an index of 75, or 75% of a target. Do not let the size of the printed number distract you from its meaning.

Read the time period. Annual, quarterly, and April-to-November figures are different. A year-on-year comparison and a comparison with the previous quarter also use different reference periods.

Read the basis. Current-price output includes price effects. Constant-price output is designed to measure output after adjusting for price changes. A budget estimate is a plan; an actual expenditure figure records what happened.

Read the notes. Revised estimates, missing observations, a changed index base, and rounding can affect a comparison. A dash or blank cell is not necessarily zero.

NCERT’s Presentation of Data explains why titles, row and column headings, units, sources, and notes are essential parts of a statistical table.

3. Choose the calculation the question actually asks for

Absolute change

Change = new value - old value

If output rises from 160 tonnes to 200 tonnes, the change is +40 tonnes. If it falls from 200 to 160 tonnes, the change is -40 tonnes, or a decrease of 40 tonnes.

Keep the original unit. An absolute change in tonnes is not a percentage.

Percentage change

Percentage change = [(new value - old value) / old value] x 100

For the increase from 160 to 200:

(40 / 160) x 100 = 25%.

For the reverse movement from 200 to 160:

(-40 / 200) x 100 = -20%.

The size of the absolute movement is the same, but the starting values differ. Percentage increases and decreases are not automatically reversible.

If the initial value is zero, this formula involves division by zero. State the absolute change instead of calling the growth rate 100%. Negative initial values also make ordinary growth language awkward; explain the actual movement rather than trusting the sign of a mechanically calculated percentage.

Share of a total

Share = (part / relevant total) x 100

If education spending is Rs 90 crore out of total expenditure of Rs 600 crore, its share is 15%.

Use the total from the same year and the same coverage as the part. Do not divide a state’s spending by a national total unless that is specifically the share being asked for.

Percentage-point change

Percentage-point change = new percentage - old percentage

A rate rising from 12% to 15% increases by 3 percentage points.

Its relative percentage increase is:

[(15 - 12) / 12] x 100 = 25%.

Both statements can be correct, but they answer different questions. Write the unit explicitly. The Office for National Statistics uses percentage points when describing differences between inflation rates and their contributions.

4. Worked response: exports rise, but the deficit widens

Consider this trade table. All values are in Rs crore and cover comparable full years.

Item	Year A	Year B
Exports of goods	240	300
Imports of goods	300	390

Question A: Calculate export growth

Export growth = [(300 - 240) / 240] x 100 = 25%.

A complete answer reads: “Exports of goods increased by Rs 60 crore, or 25%, from Year A to Year B.”

Question B: Calculate import growth

Import growth = [(390 - 300) / 300] x 100 = 30%.

Imports increased by Rs 90 crore and grew faster in percentage terms than exports.

Question C: Did the goods trade deficit narrow?

Deficit magnitude = imports of goods - exports of goods.

• Year A: 300 - 240 = Rs 60 crore.
• Year B: 390 - 300 = Rs 90 crore.
• Widening: 90 - 60 = Rs 30 crore, or 50% of the initial deficit.

A strong response is:

If you use the trade balance convention of exports minus imports, the balances are -60 and -90. That is consistent with the deficit getting larger. State the convention so a negative sign does not become a source of confusion.

Do not conclude that the entire balance of payments worsened by Rs 30 crore. The table covers goods only. It gives no information about services, income flows, transfers, or financial flows.

Also avoid turning this example into the rule “faster import growth always widens the deficit”. With different starting values, growth percentages alone can mislead. Calculate the actual balances.

5. Worked response: spending rises while its share falls

Here is a second table, also in Rs crore.

Item	Year A	Year B
Education expenditure	90	108
Total expenditure	600	900

Education expenditure increased by:

[(108 - 90) / 90] x 100 = 20%.

Its share of total expenditure was:

• Year A: (90 / 600) x 100 = 15%.
• Year B: (108 / 900) x 100 = 12%.

The share fell by 3 percentage points. Relative to its original 15% share, that is a 20% decline in the share.

A useful inference is:

“Education expenditure rose by 20%, but its share of the budget fell from 15% to 12% because total expenditure grew faster, by 50%.”

An inaccurate inference is:

“Education expenditure was cut by 3%.”

The rupee amount was not cut. Its proportion of a larger total fell.

Can you say that educational outcomes deteriorated? No. The table does not tell you about student numbers, prices, efficiency, or outcomes. It establishes a spending pattern, not the quality of education delivered.

A related trap: percentage of a budget estimate

Suppose actual expenditure is 60% of a Rs 100 crore estimate in Year A and 50% of a Rs 160 crore estimate in Year B.

The actual amounts are Rs 60 crore and Rs 80 crore. The percentage of the estimate fell, but actual spending rose.

This is why a chart labelled “percentage of budget estimates” must not be read as though it shows rupee amounts or percentages of GDP.

6. Worked response: lower inflation does not mean lower prices

Assume the following is one consistent price index, measured at comparable annual dates.

Date	Price index
Year A	100
Year B	108
Year C	113.4

Inflation between A and B:

[(108 - 100) / 100] x 100 = 8%.

Inflation between B and C:

[(113.4 - 108) / 108] x 100 = 5%.

Inflation fell by 3 percentage points, but the price index increased from 108 to 113.4. Prices continued to rise, at a slower rate. This is disinflation.

Deflation would mean a falling general price level. For instance, a fall in the index from 108 to 105 would give an inflation rate of approximately -2.78%.

The Reserve Bank of Australia’s inflation explainer distinguishes price levels from their rate of change and explains inflation measurement.

Notice another detail: prices rose by 13.4% from Year A to Year C, not 13%. The second year’s 5% increase applies to 108, not to the original 100:

1.08 x 1.05 = 1.134.

Use the same caution with output growth. A positive growth rate that falls from 7% to 4% normally indicates slower expansion of the measured output, not a 3% fall in output.

7. Worked response: derive the missing economic variable

Some questions give you a table that must be transformed before you can interpret it. Total utility is a good example.

Assume total utility at zero consumption is zero.

Units consumed	Total utility	Marginal utility
0	0	Not applicable
1	14	14
2	25	11
3	33	8
4	38	5
5	38	0
6	35	-3

Because consumption rises one unit at a time, marginal utility is the change in total utility between successive rows.

For the third unit: 33 - 25 = 8 utils.

For the sixth unit: 35 - 38 = -3 utils.

Now distinguish the questions:

• When does marginal utility first diminish? At the second unit, when it falls from 14 to 11.
• When is marginal utility zero? At the fifth unit.
• What is maximum total utility in the schedule? 38 utils, reached at both four and five units.
• When does total utility fall? On consuming the sixth unit.

“Marginal utility is diminishing” does not mean “total utility is falling”. Total utility can keep increasing while each additional unit adds a smaller positive amount.

If quantities jump by more than one unit, use change in total utility divided by change in quantity. That gives an average change per unit over the interval; it does not reveal every individual unit’s marginal utility.

For more practice with this distinction, see total utility, marginal utility, and the saturation point.

8. Turn a calculation into a defensible inference

Try this three-part structure:

Observation + numerical evidence + economic meaning.

For example:

“The education share fell from 15% to 12%, a decline of 3 percentage points. Education expenditure increased, but more slowly than the overall budget.”

Add a limitation only when it matters to the question:

“These expenditure figures alone do not show whether educational outcomes improved.”

The limitation should be specific. Repeating “more data is needed” after every answer does not help unless you identify what information is missing and why.

Separate observation, explanation, and proof

Suppose a table shows a rise in an interest rate alongside slower investment growth.

You may observe that both changes occurred over the period. If asked for a possible explanation, you can explain that higher borrowing costs may discourage some investment, other things remaining equal.

You cannot claim that the table alone proves the interest-rate change caused the slowdown. Expectations, demand conditions, and other influences could also matter. The Australian Bureau of Statistics explanation of correlation and causation makes this distinction explicit.

Useful phrases include “the figures show”, “this is consistent with”, and “one possible explanation is”. Choose the phrase that matches the strength of the evidence.

Match the denominator to the claim

Suppose 40% of a sample of 30 households reports a particular spending habit. That means 12 sampled households. It does not mean 40% of all households in the country share that habit.

Similarly, a lower unemployment rate does not by itself prove fewer unemployed people. If the labour force changes, the count and the rate can move differently. Identify the population behind the percentage before writing about people.

9. Check graphs as carefully as tables

For a bar chart, read the vertical scale and legend before comparing heights. A shortened axis can make a small difference look dramatic. Read the values rather than judging the picture alone.

For a line graph, distinguish the endpoints from the path between them. A series that rises from 100 to 115 but passes through 120 did not increase continuously. Say it “rose overall” if that is what the data shows.

For a pie chart, check what the whole represents. A 20% share of a small budget can be less money than a 10% share of a much larger budget.

For index numbers, check that the base and definitions are comparable. An index of 125 means 25% above its own base-period value. It does not mean Rs 125, and it does not prove that one country’s price level is higher than another’s.

10. A short practice set

Try writing both the calculation and one sentence interpreting it before checking the answers.

1. Output rises from 500 to 575 units. Find the absolute and percentage increase.
2. A rate falls from 10% to 8%. Find the percentage-point fall and the relative percentage fall.
3. Health spending rises from Rs 40 crore to Rs 54 crore. Total expenditure rises from Rs 200 crore to Rs 300 crore. Did health’s share rise?
4. A price index rises from 120 to 126. Calculate inflation. If the previous year’s inflation was 8%, have prices fallen?
5. A firm sells 200 units at Rs 30 each, then 240 units at Rs 28 each. Calculate the percentage change in total revenue.
6. Government expenditure is 75% of a Rs 400 crore budget estimate in one year and 70% of a Rs 500 crore estimate in the next. Did the amount spent fall?

Answers and the sentence that earns its place

1. The absolute increase is 75 units. Percentage growth is (75 / 500) x 100 = 15%. Output rose by 15% over the period.

2. The rate fell by 2 percentage points. The relative fall is (2 / 10) x 100 = 20%. Avoid the ambiguous statement “it fell by 2%”.

3. The shares are 20% and 18%. Spending increased by 35%, but its share fell by 2 percentage points, as the total grew by 50%.

4. Inflation is (6 / 120) x 100 = 5%. Prices rose by 5%; inflation slowed by 3 percentage points. This is disinflation, not deflation.

5. Revenue rises from Rs 6,000 to Rs 6,720. Growth is (720 / 6,000) x 100 = 12%. The increase in quantity sold more than offset the lower price. Do not simply subtract the percentage price fall from the percentage quantity increase.

6. Spending rises from Rs 300 crore to Rs 350 crore. The amount increased by Rs 50 crore, despite a lower percentage of the estimate being spent.

11. Before you move to the next question

Check that your answer names the variable and time period, uses the correct starting value, and carries the right unit. Then check whether you have accidentally turned a rate into an amount, a share into a total, or an association into a proven cause.

Round at the end where possible. If an answer is approximate, say so. If the source figures are rounded, tiny inconsistencies in totals may reflect that rounding rather than an economic mystery.

For examination-style practice, the official Economics specimen paper and answer key includes table and chart interpretation alongside economic calculations. Use its wording and answer key to practise matching the response to the exact task.

Frequently asked questions

1. What is an Economics data-response question?

It asks you to use information in a table, graph, chart, or passage to answer an economic question. You may need to identify a fact, calculate a value, compare figures, explain a pattern, or assess a claim.

2. Which number goes in the denominator for percentage change?

Use the original or starting value for the period being compared. For growth from 80 to 100, divide the increase of 20 by 80, giving 25%.

3. When should I write percentage points?

Use percentage points for the arithmetic difference between two percentages. A share rising from 18% to 21% increases by 3 percentage points. Its relative percentage increase is a separate calculation.

4. Can an amount rise while its share falls?

Yes. If the total grows faster than the part, the part can become larger in absolute terms but smaller as a proportion of the total. The education-spending example shows exactly this.

5. Does falling inflation mean goods are getting cheaper?

Not necessarily. If inflation remains positive, the general price level is still rising, though more slowly. Falling general prices correspond to deflation.

6. How much theory should I include?

Include the theory needed to answer the question. A request for a calculation usually needs clear working and a result. A request for an explanation also needs the relevant economic mechanism linked to the data.

7. Can I infer a cause from two figures moving together?

Their movement alone does not establish causation. You can describe the association and, if asked, give a possible economic explanation with its assumptions. Avoid presenting that explanation as proven by the table.

8. What if the table has a blank cell or a dash?

Read the notes and legend. It could indicate missing information, a value that is not applicable, or a rounded quantity. Treat it as zero only if the table’s convention or question supports that interpretation.

9. What if my percentage calculation starts from zero?

The usual percentage-change formula is undefined because it would divide by zero. Report the absolute movement and explain that ordinary percentage growth cannot be calculated from a zero base.

10. How do I write an inference without making it vague?

Name the variable, include the relevant figures or calculated change, and explain their economic meaning. Keep the conclusion within the coverage of the evidence. One accurate, supported sentence is more useful than several broad claims.