While the tools for marketing are changing, two fundamentals aren’t. One is that two out of every three of your marketing messages will be overlooked or ignored. The other is that the value of repeated exposure depends on those exposures coming close enough together to build on one another. Place an ad once a quarter, and you lose any momentum you might have enjoyed. This is true in every medium — print, digital, broadcast or out of home. Deliver your marketing messages close enough to one another that, even with the “2 out of 3” rule, yours can register and impact your sales.