Integrative, interest-based negotiation can facilitate constructive, positive relationship and establish contracts between parties on a foundation of goodwill. It is important to note it can only facilitate these positive outcomes, it does not guarantee that the other party will not seek to be opportunistic at a later time during the life of the contract. Previous knowledge of the behaviours of the other party regarding honouring contractual and other commitments will be useful here in predicting long-term outcomes, not ensuring that they will not leverage their advantages.

Explanation
Principled negotiation is based on four fundamentals: people, interest, options andcriteria:

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1st Principle: separate the people from the problem: Negotiator should depersonalise the situation and accepting that the subject matter of the negotiation. This can be difficult for untrained negotiators, but this is a key skill to develop
2ndprinciple: focus on interests, not positions: It is important in principled negotiations not to focus on their parties' positions (what are expressed during negotiations), but on the interests (underlying needs) behind them
3rd principle: invent options for mutual gains: this principle aims to help the parties find a solution that both would benefit from. The more options - or tradeables - that can be brought to the table the better.
4th principle: insist on using objective criteria: is about making sure that the negotiation stays focused on outcomes based on objective criteria and that it is productive.
LO 1, AC 1.2

Explanation
Competing is assertive anduncooperative, a power-oriented mode. When competing, an individual pursues his or her own concerns at the other person's expense, using whatever power seems appropriate to win his or her position. Competing might mean standing up for your rights, defending a position you believe is correct, or simply trying to win. Competing will not allow long-term relationship to flourish.
Compromising is intermediate in both assertiveness and cooperativeness. When compromising, the objective is to find an expedient, mutually acceptable solution that partially satisfies both parties. Compromising falls on a middle ground between competing and accommodating, giving up more than competing but less than accommodating. Likewise, it addresses an issue more directly than avoiding but doesn't explore it in as much depth as collaborating. Compromising might mean splitting the difference, exchanging concessions, or seeking a quick middle-ground position. It is a valid approach when long-term relationships are at stake and it is important to find some common ground on which to base an agreement. Both sides get something but not everything. Therefore, this is the most appropriate for this scenario.
Avoiding is unassertive and uncooperative. When avoiding, an individual does not immediately pursue his or her own concerns or those of the other person. He or she does not address the conflict. Avoiding might take the form of diplomatically sidestepping an issue, postponing an issue until a better time, or simply withdrawing from a threatening situation. In the scenario, both parties want to take the opportunity, then avoiding is not an appropriate solution.
Accommodating is unassertive and cooperative-the opposite of competing. When accommodating, an individual neglects his or her own concerns to satisfy the concerns of the other person; there is an element of self-sacrifice in this mode. Accommodating might take the form of selfless generosity or charity, obeying another person's order when you would prefer not to, or yielding to another'spoint of view. In the scenario, neither party shall concede all of their requirements, it is unnecessary to adopt this approach.
LO 1, AC 1.1

Explanation
Knowing supplier's fixed and variable costs is beneficial for the buyer in a negotiation. With these insights, the buyer would know the volume atwhich the supplier reaches break-even points and then offers significant discount due to economies of scale.

To answer this question, you should know The seller's perspective as in 'How to Negotiate Professionally':
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In the scenario, the buyer's spend is low, while they seem unattractive to seller (as they tend to pay late). So the buyer is classified as Nuisance in seller's perspective.