Past performance does not guarantee future media results

Just because a stock rose 20% last month does not mean that it will rise another 20% next month. It’s a basic principle in finance: Past performance does not guarantee future results. The same is true in marketing.
Young people are listening to more radio
Two weeks ago, Nielsen reported that erstwhile teenagers are now tuning into more radio than before:
“Back in spring of 2011, consumers 12-17 spent an average of nine hours and 15 minutes with radio each week – not i