In his book “Successful Advertising,” Thomas Smith, says this about effective frequency in advertising:
The 1st time people look at ad, they don’t see it.
The 2nd time, they don’t notice it.
The 3rd time, they are aware that it is there.
The 4th time, they have a fleeting sense that they’ve seen it before.
The 5th time, they actually read the ad.
The 6th time, they thumb their nose at it.
The 7th time, they get a little irritated with it.
The 8th time, they think, “Here’s that confounded ad again.”
The 9th time, they wonder if they’re missing out on something.
The 10th time, they ask their friends or neighbors if they’ve tried it.
The 11th time, they wonder how the company is paying for all these ads.
The 12th time, they start to think that it must be a good product.
The 13th time, they start to feel the product has value.
The 14th time, they start to feel like they’ve wanted a product like this for a long time.
The 15th time, they start to yearn for it because they can’t afford to buy it.
The 16th time, they accept the fact that they will buy it sometime in the future.
The 17th time, they make a commitment to buy the product.
The 18th time, they curse their poverty because they can’t buy this terrific product.
The 19th time, they count their money very carefully.
The 20th time prospects see the ad, they buy what it is offering.
Now consider this. Thomas Smith wrote this in 1885 when advertising was still in its infancy. Even back then, marketers were figuring out that more frequency meant more effective results.
How true this is in 2019 is probably debatable. The difference is that with today’s online campaigns, there is data available to measure the most effective frequency and the ability to optimize the campaign accordingly.