There are 6 syllabus influences on HR
The influences with the most content will be Stakeholders, Legal and Ethical(CSR). If you have to write an essay these would be the ones I would choose. The other 3 influences are self explanatory.
In summary
Economic - Economy slows people lose their jobs
Technological - Machines can do the work of people and it can help those who already have jobs and creates new industries
Social - People now want work life balance, flexible work and to have room to grow in their company.