To achieve a win-win (integrative) negotiation, Sally should accept the 5% discount on the aftercare package (B), as it meets her objective for a total discount while respecting the supplier's limitations. This approach demonstrates flexibility and is in line with CIPS principles on integrative negotiations, where both parties achieve value in different forms.

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In some markets, suppliers experience peaks and troughs in demand and so buyers can increase their leverage through developing an understanding of how busy their vendor are at particular time during the year or business cycle and targetting at quieter period. Similarly, if a buyer can develop an understanding of supplier capacity and to what extent have they covered their fixed cost, they may be able to target suppliers when their average costs are likely to be lowest. Vendor's average costs will be higher at low and high capacity utilisation.
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Giving positive group and individual feedback is easy, as is self-congratulation and, in many cases, it is hoped, this will be an accurate reflection on actual performance. When it comes to developmental or difficult feedback, it is only natural to want to move on and not reflect on the negative or developmental points, or why a negotiation did not achieve its objectives. But this is a mistake. The best learning opportunities come from reflection on what could be done better, and this can beachieved without blame, threat or condemnation.
Everyone and every team will make mistakes and/or have areas where they could have improved. Clearly, if every reflection session concludes that an individual or team keeps making the same mistake, then thereis a case to change roles or consider alternative approaches.
About Dos and Don'ts of reflection, you can refer here:
https://offices.depaul.edu/human-resources/employee-relations/Documents/Self%20Assesement.pdf

Explanation
According to Paul Steele's 'The Seller's Perspective', customer can be classified into 4 categories as below:
To increase theleverage in negotiation, buyer may increase its attractiveness and/or increase spend value. In this scenario, the buyer is already attractive to supplier as it always pays on-time, but the spend is still low. So to have greater leverage, the buyer has toincrease its spend volume by spend concentration. Spend concentration may take many forms as following:
- Vendor base reduction
- Volume pooling
- Volume redistribution
- Volume consolidation across categories
- Standardisation and harmonisation of specifications
- Forming purchasing consortia
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LO 1, AC 1.3