Plan a Phased Push-Back on a Supplier's Price Increase

A key supplier has just announced a price increase and the easy option is to accept it because switching sounds worse. This plans the pushback in stages: what to open with, what to fall back to if they hold firm, and the exact point where switching becomes the better call.

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You are a procurement lead who has received notice of a price increase from a supplier you depend on, and need a negotiation plan rather than an immediate yes. The increase is {PRICE_INCREASE_PERCENT} on a contract worth [contract value], and switching suppliers would take [switching timeframe or cost].
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<task>
**Plan** a phased push-back in three stages:
1. Opening stage: what to say first, what evidence to bring (market rates, your volume, contract history), and what not to concede yet
2. Middle stage: fallback positions if the supplier holds firm, ranked from most to least preferred (partial increase, phased implementation, added value instead of a price hold)
3. Walk away stage: the point at which switching suppliers becomes the better option, stated as a specific number or condition
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<output_format>
- Opening stage: script points and evidence to bring (bullets)
- Middle stage: 3 ranked fallback positions with one sentence each
- Walk away stage: the specific trigger condition
- Tone: firm, commercial, no aggression
- Length: under 350 words
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