The supply of labour curve shows the ability and willingness of people to make themselves available to work at different wage rates.
Factors influencing the supply of labour
the wage
Population and distribution of age
Non-monetary benefits
Education/training/qualification
Trade unions and barriers to entry
Wages and conditions of other jobs
Legislation
Elasticity of labour supply
Skills & qualifications
Unemployment levels
Time
If a job as no skill requirements an increase in wage would lead to an increase in supply as it is easy to get employed. Therefore supply is elastic
In a market where the job requires lots of skills and qualifications supply will be inelastic
High unemployment would suggest elastic supply as if wages increase the supply would increase as it would be very responsive to a change in wage
If unemployment is low the supply of labour will be inelastic as an increase in wage will only lead to a small increase in supply, so supply would be unresponsive to wage changes