| 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 |