
108 7: Preparing accounts: concepts and conventions ⏐ Part B Accounting systems and accounts preparation
2 Costs and values
2.1 Historical cost
A basic principle of accounting is that resources are normally stated in accounts at historical cost, ie at the amount
which the business paid to acquire them.
An important advantage of doing this is that the objectivity of accounts is maximised: there is usually documentary
evidence to prove the amount paid to buy an asset or pay an expense. In general, accountants prefer to deal with costs,
rather than 'values'. Valuations tend to be subjective and to vary according to what the valuation is for.
A company acquires a machine to manufacture its products, with an expected useful life of four years. At the end of two
years the company is preparing a statement of financial position and has to value the asset.
Possible costs and values
• Original cost (historical cost)
• Half of the historical cost (half of its useful life has expired)
• Secondhand value
• Replacement cost of an identical machine
• Replacement cost of a more modern (technologically advanced) machine
• Economic value (ie the amount of the profits it is expected to generate during its remaining life)
All of these valuations have something to commend them, but the great advantage of the first two is that they are based
on the machine's historical cost, which is verifiable. The subjective judgement involved in the other valuations,
particularly the last, is so great as to lessen the reliability of any accounts based on them. The second method, or a
variation of it, is the one which will normally be used (see Chapter 9).
2.2 Example: costs and values
Brian sets up in business on 1 January 20X6 selling accountancy textbooks. He buys 100 books for $5 each and by 31
December 20X6 he manages to sell his entire inventory, all for cash, at a price of $8 each. On 1 January 20X7 he
replaces his inventory by purchasing another 100 books. This time the cost of the books has risen to $6 each. Calculate
the profit for 20X6.
Solution
In conventional historical cost accounting, Brian's profit would be computed as follows.
$
Sale of 100 books (@ $8 each) 800
Cost of 100 books (@ $5 each)
500
Profit for the year
300
The purchase of the books is stated at their historical cost. Although this is accepted accounting practice, and is the
method we will be using, it involves an anomaly which can be seen if we look at how well off the business is.
On 1 January 20X6 the assets of the business consist of the 100 books which Brian has purchased as inventory. On 1
January 20X7 the business has an identical inventory of 100 books, and also has cash of $200 (ie $800 received from
customers, less the $600 cost of replacing inventory). So despite making a profit of $300, measured in the conventional
way, the business appears to be only $200 better off.
This anomaly can be removed if an alternative accounting convention is used. Suppose that profit is the difference
between the selling price of goods and the cost of replacing the goods sold. Brian's profit is as follows.
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