A.Definelabor productivity.How do we measure an individual worker's labor productivity?

B.Why is it difficult to measure the labor productivity of a government employee, even when an essential public service (e.g. police department, fire department, court house) is being performed?

C.Tim Harford says that labor productivity is greater in cities than in rural areas.He goes on to say that then internet has given cities evenmoreof a labor productivity advantage over rural cities.Explain Tim Harford's reasons.

Please answer as part A,B and C separately.