Final answer:
An unfavourable labour efficiency variance indicates that actual labour hours worked exceeded the standard labour hours for the production level achieved.
Step-by-step explanation:
An unfavourable labour efficiency variance indicates that the actual labour hours worked exceeded the standard labour hours for the production level achieved. This means that more labour hours were used than expected, resulting in inefficiency. The variance can be calculated by multiplying the difference between actual and standard labour hours by the standard labour rate per hour. An unfavourable labour efficiency variance can have various causes, such as inexperienced or unskilled workers, poor supervision, or inefficient work processes.