Including the Stock Market Debut of snapchats parent company. The shares jumped more than 40 on their first day of trading. Well, one American School which invested 15,000 in the startup back in 2012, has banked millions, so today we want to know whats the best investment youve ever made. Just use the hashtag bbcbizlive. Welcome to the programme. We begin with advertising. It often serves as an important key early indicator of how well an economy is faring. When advertising is doing well, were buying and selling and economies tend to be growing. The worlds biggest advertising agency, wpp, hasjust published its full year results in the last hour and a half. In a moment well hear from the companys founder and chief executive, sir martin sorrell, but first lets take a look at the numbers. Annual pre tax profits of 2. 3 billion for the group, up 26 on the previous year. The group has reported 2016 like for like net sales up 3. 1 . However, that growth may be about to change as wpp has set