A useful model of personal power that has survived the test of time and provide a simple way to analyse negotiation in French and Raven's Power BaseModel, which describes six bases of power:

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Monopolies exist in many markets in real life for very different reasons:
Ownership of a Key Resource: When one company exerts sole control over a resource that is necessary for the production of a specific product,the market may become a monopoly. For example, the only medication deemed acceptable to treat a disease comes from a particular ingredient X, and knowledge of this ingredient X is owned by a single family owned company. The company can, therefore, be saidto have a monopoly over ingredient X that is needed to cure the disease because it is the only company that can produce a product deemed acceptable.
Government Franchise: In certain instances, a monopoly may be explicitly created by the government if it grants a single company, whether private or government-owned, the right to conduct business in a particular market. For example, when a national railways transportation service is created by the government, in most cases they are granted a monopoly on the operation of passenger trains in the country. As a result, other firms are only able to offer passenger train services with the cooperation and/or permission of the government-owned provider.
Intellectual Property Protection: Extending intellectual propertyprotection to a company in the form of patents and copyrights is yet another way in which monopolies are created. When a government does this, it is in fact giving a single company an exclusive right to provide a particular product / service to the market. Patents and copyrights work in providing owners of intellectual property with the right to act as an exclusive provider of a new product for a specific length of time. This creates a temporary monopoly in the market with regards to new products and services.
Natural Monopoly: A market may also become a monopoly simply because it may be more cost-effective for one company to serve the whole market than to have several smaller firms in competition with one another. A company with virtually unlimited economies of scale is referred to as a natural monopoly. Such firms become monopolies due to their position and size, which makes it impossible for new entrants in the market to compete price-wise. Natural monopolies are common in industries with high fixed costsand low marginal costs of operation such as providers of television, telephone, and internet services.
In this question, 'A single firm is very large' is not enough to tell whether this market is monopolistic.

The assumption is false, because when aprocurement professional negotiates on behalf of his employer, he brings the power of his organisation (its brand, reputation and purchasing spend) as well his own personal power (that which is embedded within him) to the negotiation.
From a negotiation perspective, both organisational and personal power have the ability to influence the behaviours of other or the cause of event. This power is clearly core to negotiation, and of enormous important in seeking to achieve the objectives.

According to the book 'Influencing: Skills and techniques for business success' by Fiona Dent and Mike Brent, there are two major influencing styles. Push tends to be directive. It tells, and is clear and resolute, but needs to be employed in situations where firmness is required because of difficulties that exist or weakness is evident.
Pull is more participatory and collaborative. It seeks to incorporate everyone's perspective. It can appear wishy-washy if not skilfully employed. That approach should be followed which is most likely to secure commitment and not mere compliance.
The two divisions can be further divided into four style categories: directive; persuasive reasoning; collaborative - team oriented, people oriented to inspire them with a vision. The directive style relies on your expertise and reputation being respected by others, and where there really does seem to be one answer. It is "I" driven whereas persuasive reasoning is more "we" and issue driven. Directive styles can make the user appear as "a bull in a china shop"; persuasive reasoning can be portrayed as tough guy.
Collaborative influencing takes the "we" element further and seeks to mobilise everyone's ideas in a journey of discovery. It may have the flavour of "I'm your best friend", which may not go down too well. Visioning style is concerned to stir people's emotions in support of achieving an objective. This last one has been used by demagogues to stir people's hearts and minds for evil purposes as well as good.
A useful table offers the benefits, problems, words and body language associated with each style along with advice on when to use and when to avoid each. Cases and exercises illustrate these styles.
Empathy comes in for extended treatment with the definition of "standing in the other's shoes". This does not necessarily happen just intuitively, and therefore before a specific influencing effort there should bean intense effort to think about the other person or persons and to sense what it might feel like to be them - their hopes, fears, concerns, what turns them on, what turns them off, where are they coming from.

There are several pricing strategies used by suppliers:
Cost-plus pricing - Total variable + Fixed cost + profit
Premium pricing - based on branding. Supplier determines to charge a very high price, notconnected with cost structures, usually based on its reputation and/or the perception that the product/service is of a superior quality. This strategy typically found in the early part of the product life cycle/when demand exceeds supply.
Penetration pricing - Supplier attempts to enter a new market or extend its share in an established one. It is characterised by price reductions to increase volume, followed by steady price increases; may even be loss leading at start (no profit made) Marginal cost pricing - covers only variable cost Market pricing - suppliers prices in line with what the market is willing to pay