High levels of horizontal integration lead to high levels of communication within the business. Another benefit of using this strategy is that it leads to a larger market for merged businesses, and it is easier to build good reputations for a business when using this strategy. A disadvantage of using a diversification strategy is that the benefits could take a while to start showing, which could lead the business to believe that the strategy in ineffective. Another disadvantage or risk is, it has been shown that using the horizontal diversification method has become harmful for stock value, but using the vertical diversification had the best effects.
If you follow yoga instructors on Instagram you must have seen them promoting products of certain brands. It is clear that co-branding or affinity marketing represents a partnership between two businesses with similar interests. They aren’t competitors to each other. Hence, there is no fear of losing your customer base. Affinity marketing refers to creating a product with another business to boost its sales.
Personal selling involves an oral presentation given by a salesperson who approaches an individual or a group of potential customers. Personal selling allows for two-way communication and relationship building that can aid both the buyer and the seller in their goals. Personal selling is most commonly seen in business-to-business marketing (e.g.: selling machinery to a factory, selling paper to a print shop), but it can also be found in business-to-consumer marketing (e.g.: selling cars at a dealership). 
Marketing is not confined to any particular type of economy, because goods must be exchanged and therefore marketed in all economies and societies except perhaps in the most primitive. Furthermore, marketing is not a function that is limited to profit-oriented business; even such institutions as hospitals, schools, and museums engage in some forms of marketing. Within the broad scope of marketing, merchandising is concerned more specifically with promoting the sale of goods and services to consumers (i.e., retailing) and hence is more characteristic of free-market economies.
The functional level relates to departments within the SBUs, such as marketing, finance, HR, production, etc. The functional level would adopt the SBU's strategy and determine how to accomplish the SBU's own objectives in its market. To use the example of the sports goods industry again, the marketing department would draw up marketing plans, strategies and communications to help the SBU achieve its marketing aims.
Now imagine you had that brochure on your website instead. You can measure exactly how many people viewed the page where it's hosted, and you can collect the contact details of those who download it by using forms. Not only can you measure how many people are engaging with your content, but you're also generating qualified leads when people download it.
This refers to how the product gets to the customer; the distribution channels and intermediaries such as wholesalers and retailers who enable customers to access products or services in a convenient manner. This third P has also sometimes been called Place or Placement, referring to the channel by which a product or service is sold (e.g. online vs. retail), which geographic region or industry, to which segment (young adults, families, business people), etc. also referring to how the environment in which the product is sold in can affect sales.  5 Digital Marketing Skills to Master for 2020 & Beyond