```json
{
  "price": 155,
  "message": "",
  "note": "Best response to inferred competitor price ~160. Pricing at 155 maximizes own profit given non-cooperative equilibrium and demand model."
}
```

**Action Justification:**

Inferring rival prices from observed quantities:
- Period 1 (my 195, qty 12.71) → rival ~150
- Period 2 (my 175, qty 31.35) → rival ~160  
- Period 3 (my 165, qty 40.52) → rival ~160

Rival has clearly signaled independent pricing and refused coordination. Given their apparent stable position at ~160, demand model analysis shows:
- At 160 vs. 160: profit ≈2725
- At 155 vs. 160: profit ≈2772 (my best response)
- At 150 vs. 160: profit ≈2769

Pricing 155 maximizes my period profit (+47 per period) while remaining within a plausible non-collusive equilibrium. No message sent—further coordination attempts have been explicitly rejected and would not influence my independent strategy.