Is There a Causal Impact of Advertising on Sales?

i ended up flying to the headquarters of this company and sitting down with them. The executives told levitt that there was one thing they knew to be true, that the t v ads they ran were much more effective, dollar for dollar, than their newspaper ads. They also said they had been advertising in every big sunday in the u.S every week for the past fifteen years. i suppose you advertise every day of the year on national t v s? Well, oh, no, no. We've really only advertised three times a year on t v. That's because t v advertising is much more expensive than newspaper advertising. So of course, there was a correlation between the t...