From Statistics Explained
Labour productivity measures the amount of goods and services produced by each member of the labour force or the output per input of labour. It can be measured in a variety of ways.
For structural indicators, it may be measured by gross domestic product (GDP), expressed in terms of the purchasing power standard (PPS), either relative to the number of employed people or to the number of hours worked. In both cases, it is then expressed as an index.
Within national accounts and structural business statistics, labour productivity is often defined as the value added per employed person.