There are two kinds of external marketing environments; micro and macro. These environments’ factors are beyond the control of marketers but they still influence the decisions made when creating a strategic marketing strategy.

Micro Environment Factors:

The suppliers: Suppliers can control the success of the business when they hold the power. The supplier holds the power when they are the only or the largest supplier of their goods; the buyer is not vital to the supplier’s business; the supplier’s product is a core part of the buyer’s finished product and/or business.

The resellers: If the product the organisation produces is taken to market by 3rd party resellers or market intermediaries such as retailers, wholesalers, etc. then the marketing success is impacted by those 3rd party resellers. For example, if a retail seller is a reputable name then this reputation can be leveraged in the marketing of the product.

The customers: Who the customers are (B2B or B2C, local or international, etc.) and their reasons for buying the product will play a large role in how you approach the marketing of your products and services to them.

The competition: Those who sell same or similar products and services as your organisation are your market competition, and they way they sell needs to be taken into account. How does their price and product differentiation impact you? How can you leverage this to reap better results and get ahead of them?

The general public: Your organisation has a duty to satisfy the public. Any actions of your company must be considered from the angle of the general public and how they are affected. The public have the power to help you reach your goals; just as they can also prevent you from achieving them.

http://blog.oxfordcollegeofmarketing.com/2014/11/04/the-impact-of-micro-and-macro-environment-factors-on-marketing/