ANSWER:
Publicity is the promotion type which is least expensive for a company.
Step-by-step explanation:
A company can publicize its names, products, and services by organizing an event or by organizing a seminar. The aim of publicity is to make consumers aware about the products and services that a company deals in.
Publicity creates awareness about the products or services and therefore creates potential consumers. Companies also do not need to spend a lot of money for publicity.