| Value | Category |
|---|---|
| -9 | Don't know (spontaneous) |
| 1 | Personal acquaintance |
| 2 | Physical proximity close to this establishment |
| 3 | Belongs to same Business Association than this establishment |
| 4 | Recommended by business associates/suppliers/customers |
| 5 | Only supplier whose products meet specifications |
| 6 | Supplier is government owned with guarantees |
| 7 | Other reason |
| 8 | Supplier has international certification |
| Sysmiss |