A Level Economics · Topic guide

Wage Differentials Between Occupations and the Gender Pay Gap

Wage differentials are differences in the pay of different types of labour, explained by the marginal revenue product (MRP) theory of wage determination: pay depends on the value of a worker's marginal output and on the supply of labour to that occupation.

Grades A*-E (A Level)MicroeconomicsAQAWJECEduqas

Before you start

Make sure you're comfortable with these topics first:

Method

  1. Identify the two sides of the labour market for each occupation being compared: demand, driven by the marginal revenue product of labour, and supply, driven by the number of people qualified and willing to work in that occupation.
  2. Learn the determinants that make MRP (and therefore demand for labour) high: high productivity, a high price or value for the good or service produced, and few substitutes for the worker's skill.
  3. Learn the determinants that make labour supply to an occupation low, and therefore push the wage up: long or expensive training, natural scarcity of the skill or talent, unpleasant or risky conditions requiring a compensating wage differential, and trade union bargaining power.
  4. Draw two labour market diagrams side by side, one for the higher paid and one for the lower paid occupation, showing demand (MRP) and supply curves positioned to generate the different equilibrium wages, and label the equilibrium wage and quantity of labour on each.
  5. For the gender pay gap specifically, separate the 'explained' component (differences in hours worked, sector, seniority and qualifications) from the 'unexplained' or residual component, which is the part most consistent with discrimination.
  6. For an evaluation question on wage differentials or the gender pay gap, weigh market-based explanations (productivity, supply and demand) against structural and social explanations (discrimination, occupational segregation, caring responsibilities), and judge which matters most for the specific case in the question.

Worked example

A firm employs surgeons and hospital cleaners. A surgeon's output (a completed operation) generates 2,000 pounds of value to the hospital and a surgeon can perform 2 operations a week, so weekly marginal revenue product is 4,000 pounds. A cleaner's marginal physical product is valued at 15 pounds an hour and a cleaner works 35 hours a week. Calculate each worker's weekly marginal revenue product, and explain, using labour supply, why the cleaner's wage is far below this value while the surgeon's wage is close to it.

  1. The surgeon's weekly MRP is already given: 4,000 pounds.
  2. Calculate the cleaner's weekly MRP: 15 x 35 = 525 pounds.
  3. In a competitive labour market a firm is willing to pay up to a worker's MRP, so both figures represent the maximum a rational employer would pay each week.
  4. The surgeon's case: the supply of qualified surgeons is very low relative to demand, because training takes many years and requires rare aptitude, so surgeons can bargain a wage close to their high MRP.
  5. The cleaner's case: the supply of workers able to do cleaning work is very large relative to demand, since the job requires little specific training, so competition between workers pushes the wage down towards its equilibrium level, well below any individual cleaner's MRP ceiling.

Practice questions

Type your answer and press Check to be marked straight away, or reveal the answer and mark yourself.

Q1What does MRP stand for in the theory of wage determination?Show answer

Answer: Marginal revenue product.

Got it right?
Q2Give the formula for marginal revenue product.Show answer

Answer: Marginal revenue product = marginal physical product x price (or marginal revenue) of the output.

Got it right?
Q3State one factor that increases the supply of labour to an occupation.Show answer

Answer: For example, a short or no training requirement, low entry qualifications, or pleasant working conditions.

Got it right?
Q4What is a compensating wage differential?Show answer

Answer: Extra pay needed to compensate workers for doing a dangerous, unpleasant or inconvenient job, which restricts labour supply unless the wage is higher.

Got it right?
Q5Which UK regulations require large employers to publish their gender pay gap?Show answer

Answer: The Equality Act 2010 (Gender Pay Gap Information) Regulations 2017, which apply to employers with 250 or more employees.

Got it right?
Q6Distinguish the 'explained' and 'unexplained' components of the gender pay gap.Show answer

Answer: The explained component is the part of the gap accounted for by measurable differences such as hours worked, sector, seniority and qualifications; the unexplained (residual) component is what remains after these are controlled for, and is the part most consistent with discrimination.

Got it right?
Q7A worker's MRP is 600 pounds a week but she is paid 400 pounds a week. Is this more consistent with a fully competitive labour market or an employer with wage-setting power?Show answer

Answer: An employer with wage-setting power (a monopsonist), since in a fully competitive labour market a firm should pay each worker close to her MRP.

Got it right?

Exam-style questions

Written in the style of a A Level Economics exam paper, with a full mark scheme.

Q1[6 marks]

Using the concept of marginal revenue product, explain why airline pilots typically earn more than airport check-in staff.

Show mark scheme

Tick each line you got. Your score builds from the marks on the scheme.

Nothing ticked yet - 6 available

Got it right?
Q2[20 marks]

Evaluate the likely effectiveness of gender pay gap reporting, on its own, as a policy to close the gender pay gap in the UK.

Show mark scheme

Tick each line you got. Your score builds from the marks on the scheme.

Nothing ticked yet - 20 available

Got it right?

See real A Level Economics past-paper questions, with official mark schemes

Free printable worksheet

Want more practice on paper? Download the wage differentials between occupations and the gender pay gap worksheet pack - 6 pages of exam-style questions with a full mark scheme. One email opens every download in this browser for 14 days - no account, no card. Print it for personal and classroom use.

Next topics

Ready to practise wage differentials between occupations and the gender pay gap? Add it to a printable topic pack for this student in the Pack Builder.

Add to my pack

Not quite what you needed?

Tell us what is missing on wage differentials between occupations and the gender pay gap, or which topic to write up next. Every request is read, and we reply to every one.

Build a full practice pack.

This topic is one of hundreds in the library - pick the ones a student needs and generate a printable PDF in minutes.