Study Figure 1c below, which shows the change in employment structure across three stages of economic development.
Figure 1c
| Development Stage | Primary (%) | Secondary (%) | Tertiary (%) | Quaternary (%) |
|---|---|---|---|---|
| Stage 1 (Resource-based) | 60 | 25 | 13 | 2 |
| Stage 2 (Manufacturing-led) | 25 | 40 | 30 | 5 |
| Stage 3 (Service & Information) | 5 | 18 | 57 | 20 |
Analyse the reasons for the changes in primary and quaternary employment shown in Figure 1c.