Media prices can look clear on a quote, then become hard to compare when two channels use different buying units. Digital campaigns often use CPM. TV and radio schedules may use CPT, cost per rating point, or cost per TARP. Both price audience exposure, but they do not measure the same thing. Visit : https://bestmediarates.com.au/advertising-cost-per-thousand-cpm-vs-cost-per-rating-point-cpt-what-australian-advertisers-need-to-know/