Answer: Intensive use of sales force and is relatively costly
Explanation: In simple words, personal selling refers to the traditional method of selling under which a company hires some salespeople who directly interacts with the customers and tries to persuade them to buy the product.
These workers are experts and use their knowledge and skills to teach customer how the relative product can be useful to them. These individuals works as a bridge between the customer and company, therefore, it is necessary that they are efficient.
The company has to monitor their performance and has to train them also. Therefore, this process requires heavy human capital and is costlier to maintain.