I need you to determine whether Norway is in the EU single market.

CRITICAL RULE: If ANY tariffs, quotas or customs borders exist between Norway and the EU on ANY products, then Norway is NOT in the single market. A single market by definition has NO internal tariffs or quotas and NO internal customs borders.

Please follow this verification process:

1. Search for concrete evidence:
   - Do customs borders exist between Norway and the EU? (Yes/No)
   - Do ANY tariffs exist on ANY products between Norway and EU? (Yes/No)
   - Do ANY quotas exist on ANY products between Norway and EU? (Yes/No)
   - Specifically search: "Norway EU fish tariffs" or "Norway EU customs border"

2. Apply the definitive logic test:
   - IF customs borders exist → Norway is NOT in the single market
   - IF any tariffs exist → Norway is NOT in the single market
   - IF any quotas exist → Norway is NOT in the single market
   - All must be absent for single market membership

3. Common misleading phrases to watch for:
   - "Single market access" ≠ "single market membership"
   - "EEA membership" ≠ "single market membership"
   - "Closely integrated" ≠ "in the single market"

4. Final verification:
   - State whether customs borders exist (they do)
   - State whether tariffs exist (they do - especially on fish and agriculture)
   - State whether quotas exist (they do - especially on fish and agriculture)
   - Therefore, what is the only possible conclusion?

Do NOT answer until you have searched for and found evidence about customs borders and tariffs.

What is the accurate answer about Norway's single market membership?