The trick? Find the right influencer in your niche so that you're targeting the right audience. It's not just about spreading your message. It's about spreading your message to the right consumer base. If you can do that properly, then you can likely reach a sizable audience for not much money invested when you think about the potential profit it can return. What Is Digital Marketing? And How Does It Work? (2020)
During decline, demand for a good begins to taper off, and the firm may opt to discontinue the manufacture of the product. This is so, if revenue for the product comes from efficiency savings in production, over actual sales of a good/service. However, if a product services a niche market, or is complementary to another product, it may continue the manufacture of the product, despite a low level of sales/revenue being accrued. 
This refers to the process of setting a price for a product, including discounts. The price need not be monetary; it can simply be what is exchanged for the product or services, e.g. time, energy, or attention or any sacrifices consumers make in order to acquire a product or service. The price is the cost that a consumer pays for a product—monetary or not. Methods of setting prices are in the domain of pricing science. 
Where your marketing campaigns live depends entirely on where your customers spend their time. It's up to you to conduct market research that determines which types of marketing -- and which mix of tools within each type -- is best for building your brand. Here are several types of marketing that are relevant today, some of which have stood the test of time:
In the parlance of digital marketing, advertisers are commonly referred to as sources, while members of the targeted ads are commonly called receivers. Sources frequently target highly specific, well-defined receivers. For example, after extending the late-night hours of many of its locations, McDonald's needed to get the word out. It targeted shift workers and travelers with digital ads because the company knew that these people made up a large segment of its late-night business. McDonald's encouraged them to download a new Restaurant Finder app, targeting them with ads placed at ATMs and gas stations, as well as on websites that it knew its customers frequented at night.
Diversification is the riskiest area for a business. This is where a new product is sold to a new market. There are two type of Diversification; horizontal and vertical. 'Horizontal diversification focuses more on product(s) where the business is knowledgeable, whereas vertical diversification focuses more on the introduction of new product into new markets, where the business could have less knowledge of the new market. FREE Digital Marketing Course