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8: Variance analysis ⏐ Part B Standard costing
Here are some examples of interdependent variables.
(a)
Materials price and usage
It may be decided to purchase cheaper materials for a job in order to obtain a favourable price variance,
possibly with the consequence that materials wastage is higher and an adverse usage variance occurs. If
the cheaper materials are more difficult to handle, there might be an adverse labour efficiency variance
too.
If a decision is made to purchase more expensive materials, which perhaps have a longer service life, the
price variance will be adverse but the usage variance might be favourable.
(b)
Labour rate and efficiency
If employees in a workforce are paid higher rates for experience and skill, using a highly skilled team to do
some work would incur an adverse rate variance, but should also obtain a favourable efficiency variance.
In contrast, a favourable rate variance might indicate a larger-than-expected proportion of inexperienced
workers in the workforce, which could result in an adverse labour efficiency variance, and perhaps poor
materials handling and high rates of rejects too (adverse materials usage variance).
(c)
Sales price and sales volume
The possible interdependence between sales price and sales volume variances should (hopefully) be
obvious to you. A reduction in the sales price might stimulate bigger sales demand, so that an adverse
sales price variance might be offset by a favourable sales volume variance. Similarly a price rise would
give a favourable price variance, but possibly at the cost of a fall in demand and an adverse sales volume
variance.
(d)
Cost and sales variances
(i) If there are
favourable cost variances
(perhaps cheaper labour or material have been used, say, so
that there are favourable labour rate or material price variances), the possible drop in quality of the
product could lead to an
adverse sales volume variance
because customers don’t wish to buy the
lower quality product.
(ii) If product quality is improved this might result in an
adverse cost variance
.
– If more expensive material is used (adverse material price variance)
– If labour are more careful in production of the product and hence take longer than standard
(adverse labour efficiency variance)
– If more skilled labour is used (adverse labour rate variance)
But the change in quality might result in a
favourable sales volume variance
, customers wanting
to buy more of the higher-quality product.
(iii) If costs have risen (resulting in
adverse labour rate, material price and variable overhead
expenditure variances
), the sales price might have to be increased to cover the extra costs. This
would result in a
favourable sales price variance
.
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