JCE Commerce & Accounting 26 common mistakes
JCE Commerce & Accounting 26 · Understand the traps and how to avoid them.
When computing depreciation or inventory cost, the candidate applies the annual depreciation rate or overhead rate to the entire year's production or sales volume without adjusting for the portion of the year the asset was in service or the actual level of activity.
Under time pressure, candidates default to the full-year formula they memorized and overlook that the question specifies a mid-year acquisition, a disposal date, or an activity level different from normal capacity. The mental shortcut feels efficient but ignores the explicit dates or units given.
What to do instead
Before calculating, write down the exact service period in months and the actual activity base stated in the question. Use a pro-rata factor (months/12) for time-based depreciation and actual units for activity-based methods. Re-read the final sentence to confirm which basis the question requires.
The candidate records a transaction using cash-basis thinking-for example, recognizing revenue when cash is received or expensing a cost when paid-even though the question states the entity uses accrual accounting.
Personal finance habits and the salience of cash flows lead candidates to equate economic events with cash movements. Under exam pressure, the simpler cash entry feels more intuitive than adjusting for receivables, payables, or unearned revenue.
What to do instead
For every transaction, ask two questions: has the earnings process been completed (revenue), and has the obligation been incurred (expense)? Record the receivable or payable regardless of cash. Practice with a two-column drill: cash effect versus accrual effect, until the accrual entry becomes automatic.
In process costing, the candidate computes equivalent units by simply adding beginning and ending work-in-process units to completed units, or applies the weighted-average method when the question specifies FIFO (or vice versa).
Equivalent-unit calculation has multiple steps, and candidates conflate physical units with equivalent units. They also skim the method named in the question and default to the method they practiced most recently.
What to do instead
Underline the cost-flow method (weighted-average or FIFO) in the question stem. For weighted-average, use units completed plus ending WIP equivalent units. For FIFO, use units completed plus ending WIP minus beginning WIP equivalent units. Build a three-line unit reconciliation (beginning WIP, started, completed, ending WIP) before computing equivalent units.
The candidate treats a sunk cost, allocated fixed overhead, or a non-incremental cost as relevant when deciding whether to accept a special order, make or buy, or discontinue a segment.
Allocated costs appear on the income statement and feel like real costs. Candidates also confuse avoidable and unavoidable fixed costs because both are labeled 'fixed.' The result is a decision that rejects a profitable special order or keeps an unprofitable segment.
What to do instead
For each decision, list only costs and revenues that differ between alternatives. Explicitly label each cost as avoidable or unavoidable, and exclude sunk costs and allocated common fixed costs. If a cost does not change under either option, cross it out before computing the differential amount.
The candidate analyzes a contract question by identifying the correct legal rule but then fails to apply the facts-for example, concluding that an acceptance is effective on dispatch when the offer required receipt, or missing that the mirror-image rule was modified by the UCC.
Law questions reward issue-spotting, and candidates stop after naming the doctrine. They also import common-law rules into UCC sale-of-goods questions, or vice versa, because the distinction is easy to miss in a fact pattern.
What to do instead
Use a three-step written template for every law question: (1) identify the governing body of law (common law or UCC Article 2), (2) state the rule, (3) apply each fact to the rule and state the conclusion. If the question involves goods, check UCC rules first; if services or land, use common law.
The candidate answers a negotiable-instruments or secured-transactions question by relying on general fairness rather than the specific requirements of negotiability, holder-in-due-course status, or perfection.
These topics have technical checklists (writing, signature, unconditional promise, fixed amount, payable on demand or at a definite time, payable to order or bearer). Candidates who have not memorized the checklist reason from intuition and miss one missing element that defeats negotiability.
What to do instead
Memorize the seven requirements of negotiability and the holder-in-due-course requirements as a checklist. For secured transactions, memorize the steps for attachment and perfection and the priority rules. Apply the checklist item by item to the facts before selecting an answer.
The candidate confuses a change in quantity demanded (a movement along the demand curve) with a change in demand (a shift of the curve), or misidentifies which curve shifts when a determinant such as income, input prices, or expectations changes.
The graphical vocabulary is similar, and candidates rush to a price-change answer without asking whether a non-price determinant is involved. They also forget that supply shifts when input costs change, not when the product's own price changes.
What to do instead
Before drawing, ask: which variable changed? If it is the good's own price, move along the curve. If it is income, tastes, prices of related goods, expectations, or number of buyers, shift demand. If it is input prices, technology, taxes, or number of sellers, shift supply. Label the shift direction explicitly.
The candidate computes a GDP or inflation figure by summing all transactions in the economy, including intermediate goods, transfer payments, or financial asset purchases, or by using nominal GDP when the question asks for real GDP.
GDP is a familiar term, so candidates rely on a loose definition and include anything that looks like economic activity. They also overlook the base-year adjustment when the question provides a price index.
What to do instead
Apply the expenditure approach only to final goods and services: consumption, investment, government purchases, and net exports. Exclude intermediate goods, transfer payments, and purchases of financial assets. When a price index is given, divide nominal GDP by the index (in hundredths) to obtain real GDP.
The candidate answers an organizational-behavior or management question by choosing the most morally appealing option rather than the option that matches the described contingency, leadership style, or control process.
Management questions often present plausible-sounding options that reflect good intentions but do not fit the situation. Candidates who have not internalized contingency theory default to a universal 'best' style such as participative leadership, even when the situation calls for directive action.
What to do instead
Identify the contingency variables in the stem-task structure, follower maturity, time pressure, organizational culture-and match them to the prescribed style. For control questions, distinguish feedforward, concurrent, and feedback controls by timing. Eliminate options that are universally stated ('always,' 'never') unless the theory is absolute.
The candidate miscomputes a present value, future value, or standard deviation by using the wrong number of periods, mixing an annual rate with monthly periods, or forgetting to convert a percentage to a decimal.
Financial mathematics requires precise unit matching, and candidates under time pressure plug numbers into a formula without aligning the interest rate and the number of periods. Calculator keystroke errors compound the problem.
What to do instead
Before computing, write the rate per period and the number of periods as a labeled pair. Convert annual rates to the period rate (annual rate divided by compounding periods per year) and years to periods (years times periods per year). Estimate the answer's magnitude first, then check the computed result against the estimate.