How often should you advertise?
Obviously, that’s going to depend on the specific campaign you have in mind, your business objectives, stock, and the market situation. But, it’s worth bearing in mind that the point of advertising is to get people to read the advertisement and to elicit from them the desired response. Just because you see your advertisement when it appears does not automatically mean the public has. An advertisement needs time to be seen and remembered.
As a general rule, the greater the number of repetitions, the better the retention of what was communicated in the advertisement. Forgetting occurs very rapidly after learning and then levels off, so a more lasting impression can result from placing a certain advertisement once a week for four consecutive weeks and then stopping, than advertising once a month for four months.