BSEB Intermediate Economics common mistakes
BSEB Intermediate Economics · Understand the traps and how to avoid them.
Writing that a positive statement is 'what should be' and a normative statement is 'what is', thereby reversing the two categories when labelling exam statements.
Candidates memorise the words 'positive' and 'normative' as everyday English (positive = good, normative = normal) instead of the economics meaning (positive = verifiable fact, normative = value judgement).
What to do instead
Apply a single test to every statement: can it be checked against data or logic alone? If yes it is positive; if it contains ought, should, fair, or a policy recommendation it is normative. Practise by sorting ten mixed statements and justifying each with the test rather than the label.
Treating the Production Possibility Frontier as a curve that shifts whenever output of one good changes, and confusing movement along the PPF with a shift of the PPF.
Students do not separate changes in the allocation of given resources (a point moving along a fixed curve) from changes in resources or technology (the whole curve shifting outward or inward).
What to do instead
Before answering, ask whether resources or technology changed. If only the mix of goods changed, the point moves along the same frontier; if resources, technology, or efficiency changed, the frontier shifts. Draw both cases side by side and label the axes with the two goods every time.
Explaining the downward slope of the demand curve only by 'law of demand' and omitting the income effect, substitution effect, and the reasons for exceptions such as Giffen goods and status goods.
The law of demand is learned as a slogan, so candidates cannot give the underlying causes when a question asks 'why' rather than 'what'.
What to do instead
Prepare a fixed four-point answer: income effect, substitution effect, new buyers entering, and diminishing marginal utility. Separately memorise the exception list (Giffen goods, Veblen/status goods, expectations of further price change, essentials) with one concrete example each.
Calculating price elasticity of demand with the wrong base, or reporting a negative value as if it meant the good is inferior, and confusing elasticity with the slope of the demand curve.
The formula is applied mechanically without checking whether the question wants the percentage method, total outlay method, or point method, and the sign convention is not understood.
What to do instead
State the formula and the base before substituting: percentage change uses the original price and quantity unless the question specifies the midpoint method. Report elasticity as an absolute number and interpret it with the total outlay test. Remember elasticity is not slope because percentage changes are scale-free.
Stating that when marginal product rises, total product falls, or drawing the average and marginal product curves so that marginal product cuts average product at its maximum rather than at average product's maximum.
The relationship between marginal and average values is learned verbally but not practised graphically, and the TP-MP-AP interlinkage is memorised as isolated facts.
What to do instead
Rebuild the three curves from a small numerical table (labour, TP, MP, AP) and mark the three key points: MP peaks first, MP cuts AP where AP is maximum, and TP is maximum where MP is zero. Then draw the curves directly from the table so the geometry matches the numbers.
Listing accounting cost and economic cost as synonyms, and forgetting to include implicit costs and normal profit when computing economic profit in a numerical question.
Textbook cost categories are memorised as definitions but not applied to a rupee-based problem, so implicit costs such as the owner's own labour and capital are left out.
What to do instead
Use a checklist for every cost problem: explicit payments, implicit costs (own resources, forgone salary, forgone rent), and normal profit as part of cost. Compute accounting profit first, then subtract implicit costs to get economic profit, and show both lines in the answer.
Calling any market with many sellers 'perfect competition', and failing to check the defining conditions such as homogeneous product, free entry and exit, and perfect information when identifying market forms.
Market forms are remembered by the single feature 'number of sellers', so monopolistic competition and perfect competition are merged in the candidate's mind.
What to do instead
Build a comparison table with rows for number of sellers, product differentiation, entry barriers, price control, and shape of the demand curve, and fill it for all four forms. In an identification question, test at least three conditions before naming the market.
Confusing national income with domestic income, or adding transfer payments, intermediate goods, and second-hand sales into the national income total.
The domestic-versus-national distinction (factor income from abroad) and the exclusion rules are not applied systematically, so candidates add every money flow they see.
What to do instead
Apply two filters to every item: is it a factor payment for current production, and is the earner a resident? Exclude transfers, intermediate goods, second-hand sales, and purely financial transactions. Then use the identity National Income = Domestic Income + Net Factor Income from Abroad and show the adjustment explicitly.
Treating the money multiplier as a fixed number and ignoring the reserve ratio, or describing the central bank's open market operations as changing the reserve ratio rather than buying and selling securities.
The credit creation formula is memorised without its components, so candidates cannot adapt it when the question changes the cash reserve ratio or the initial deposit.
What to do instead
Write the multiplier as 1 divided by the reserve ratio and compute total deposits as initial deposit times the multiplier, showing each step. Keep a separate list of the central bank's instruments (repo rate, CRR, SLR, open market operations, margin requirements) with a one-line description of exactly what each changes.
Confusing the investment multiplier with the money multiplier, or stating that an increase in the marginal propensity to save raises equilibrium income.
Both are called 'multiplier' and both involve a fraction, so the formulas k = 1/(1-MPC) and m = 1/CRR get swapped, and the paradox of thrift is counter-intuitive.
What to do instead
Anchor each multiplier to its own domain: the investment multiplier belongs to income determination and uses MPC; the money multiplier belongs to banking and uses the reserve ratio. Work one numerical example of each with the same numbers to see the difference, and state explicitly that a higher MPS lowers the multiplier and equilibrium income.
Classifying a government budget deficit as revenue deficit or fiscal deficit without checking whether borrowing is included, and omitting disinvestment receipts from the fiscal deficit calculation.
The deficit definitions differ by exactly one or two items, and candidates memorise the names without the item-by-item composition.
What to do instead
Write the three definitions as subtraction statements: revenue deficit = revenue expenditure minus revenue receipts; fiscal deficit = total expenditure minus total receipts excluding borrowings; primary deficit = fiscal deficit minus interest payments. Then solve one numerical question where the same data yields all three, and note that disinvestment is a capital receipt and therefore reduces fiscal deficit.
Reading the balance of payments as a single account and treating a current account deficit as automatically a crisis, or recording a foreign loan as a current account credit.
The current and capital account split and the autonomous-versus-accommodating distinction are abstract, so every foreign exchange inflow is recorded in the same place.
What to do instead
Sort each transaction into current (goods, services, income, transfers) or capital (loans, investments, reserves) before writing it. Then state that the accounts must balance overall, and explain that a current account deficit financed by capital inflows is not necessarily a problem. Practise with five mixed transactions.
Confusing currency depreciation with devaluation, and mixing up appreciation of the rupee with a rise in the exchange rate quoted as rupees per dollar.
The direction of the exchange rate quote is not fixed in the candidate's mind, so appreciation and depreciation are reversed in answers.
What to do instead
Fix the quote first: with rupees per dollar, a higher number means the rupee has depreciated. Reserve 'depreciation' and 'appreciation' for market-determined rates and 'devaluation' and 'revaluation' for official fixed-rate changes. Rehearse with a short table of exchange rate movements and label each one.