Concept:Labour efficiency refers to the productivity of workers in converting inputs into output.
Explanation:To measure the efficiency of labour, we need to compare labour input with the output it produces.
Efficiency of labour is commonly expressed as output per worker per unit of time.
This relationship is captured by an input-output ratio.
For example, if a worker produces more units of goods in one hour, the input-output ratio improves and labour efficiency increases.
A higher value of output relative to the labour input indicates greater efficiency.
The rate of inflation measures price changes, not worker productivity.
Buying more machines changes capital, not the efficiency of existing labour.
The unemployment rate shows the number of jobless people, which is not a direct measure of how well workers perform.
Therefore, the most suitable measure among the options is the input-output ratio.
Answer:B. input-output ratio