One of the merits of sales promotions is that they increase customer involvement with an organization or a particular brand. Additionally, sales promotions are quick to develop and are readily available to the target market (Grewal & Levy, 2014, p.276). On the other hand, sales promotions may condition customers to wait until there is a price reduction to make purchases and may lead to promotional clutter with information being sent to customers too regularly.
One of the advantages of personal selling that is akin to the sales promotion is customer involvement with personal selling making it a two-way interaction. The other benefit of personal selling is that it reaches out to the customers that are not accessible through other methods of marketing, such as promotional emails (Grewal & Levy, 2014, p.283). However, personal selling creates a widespread negative perception of salespersons as nagging and is expensive to train and retail a sales force of personal sellers.
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One of the perquisites of advertising is that it reaches a broad audience at a go compared to either sales promotion or personal selling. Also, advertising reaches the target audience at different times compared to personal selling. Conversely, advertising is significantly expensive in comparison with either the sales promotion or personal selling (Grewal & Levy, 2014, p.264). Excessive advertising may also lead to people sharing a dislike for ads. That is related to excessive marketing through the use of both personal selling and sales promotions.
The significant advantage of public relations is that information spreads more rapidly over a large area compared to personal selling. Moreover, public relations is considered a lower-cost marketing technique similar to sales promotions and against advertising or personal selling (Grewal & Levy, 2014, p.299). The disadvantages associated with public relations are that special skills may be required for the PR staff, and the organization may lack control over the message of the marketing, which may affect it adversely.
Reference
Grewal, D., & Levy, M. (2014). M: Marketing (6th ed.). McGraw-Hill Education.