How can one tell if interference has had an impact? There is no control group against which to compare. It is agreed that in general advertising works (else why pay for it) so how is this different?
Brian Jefferson
@bjeff1.bsky.social
453 followers 224 following 1.2K posts
Retired maths teacher, folk singer/songwriter (www.youtube.com/channel/UCe6Urf-Rcz…), grumpy old man.
