Porter’s model of competitive forces in an industry is an extension on Structure-Conduct-Performance model (SCP). SCP involves features, such as structure of industries (degree of concentration, market share distribution), conduct of firms (price setting, advertisement techniques, technology) and performance of firms/industries, (profitability related to the extent of market power)

Porter’s model assumes that there are five strengths of rivalry that classify the competitive dominance in an industry situation. The model comprises of: Pressure of substitute products As a result of wide range of substitute products available at competent prices and at a better quality, the sector of the market becomes unappealing to potential entrants, because customers can effortlessly change their supplier.

Threat of new entry This strongly depends upon the easiness of the entry to and exit from the market. Threat of potential entrants is viewed as fairly substantial when there is low capital investment necessary to start up a new enterprise, when there is inadequate variation in the markets’ produce or the previously established technology is easy to develop and attain. In cases where entry and exit barriers are substantial, profit margins are also maintained at high levels, thus driving out poorly performing firms out of the market.

Existing rivalry between prevailing firms in the market The intensity of competition measures the strength of rivalry among the already established firms in the industry. Moreover, it is heavily influenced by the quantity of opponents and their proficiencies. For instance, the rivalry is lessened if there are only a few proven and reputable firms in the market. As a consequence, there is a high risk of marketing and price wars. This is reflected in how authoritative the seller is in the presented market. To clarify, it is the ability to alter the prices of produce that is provisioned to buyers. Furthermore, it is determined by the organizing skills, the ownership of unique traits and the number of suppliers in the market substantially influence how the company is settled in the market. Bargaining power of Buyers
Buyer power is depicted in the capability of buyers to push down prices and also, the existing connection between the provider and the receiver impacts the volume of the order. For instance, if the sector comprises of a small number of firms then they have the power to negotiate suppliers’ pricing decisions and control their actions.

This model is used as a business strategy instrument and assists in exploring the strengths of an organization’s position, as well as the attractiveness of the market structure (Notesdesk, 2009).
Porter emphasized that the combination of all five forces regulate the greatness of competition for each distinct market, nevertheless the extent of each force is specifically related to a unique industry. Porter argued that if a firm is aware of the outcome of each competitive force, it can take relevant actions In order to place itself in a position to combat the burden exerted by the forces. Theoretically, the firm would pursue a ‘defendable’ position, however, Porter supposes that a firm is capable of influencing the forces by the practices they follow.
This interpretation of rivalry comprehends that not only the prevailing players in the market are real or prospective opponents. Further competition may result from "extended rivalry", which comprises of customers, suppliers, substitutes, and potential new entrants.

In relation to the SCP model, Porter's work is somehow alike but also substantially contrasts with SCP in terms of the main aim of the evaluation.

As in SCP, Porter acknowledges the significance of market structure on both firm's conduct and performance, however, distinctively from SCP, Porter emphasizes on the mutual dependence between industry structure and firms actions. Porter has also