margrethe vestager on regulating tax, and presidents and prime ministers speak with us. my goal is up at the end of our term, we will be very close to putting an end to extreme poverty. this is bloomberg. ♪ eric:this is bloomberg. ♪ . . . erik: welcome back to this special edition of "bloomberg best." i'm erik schatzker. we're focusing on the 2018 bloomberg global business forum. one of the day's liveliest panels gathered four past and present heads of state on stage for a vigorous conversation. former u.s. president bill clinton moderated, with president ivan duque of colombia, prime minister of norway erna solberg, and south african president cyril ramaphosa. mr. clinton: ok, we all live in an interdependent world. we want to work together. we believe that creative cooperation is better. you have to figure out what that means in terms of how you are going to get the economy going, how you are going to reduce inequality, and how you redeem the promise of land reform without screwing up the investment climate and making people trust you. pres. ramaphosa: apartheid was on

fine against google for depriving certain competitors of a chance to compete with them. >> margrethe vestagerinnovation by google over the last decade, well, i want their illegal behavior to stop. >> kroft: and that's what you feel has gone on. >> vestager: not only do we feel it, we mean that we can prove it. >> kroft: in researching the case, vestager says her staff went through 1.7 billion google search queries and found that google was manipulating its secret search formulas, or algorithms, to promote its own products and services and sending its competitors into oblivion. >> vestager: it's very difficult to find the rivals. because on average, you'd find them only on page four in your search results. >> kroft: and why so far down? >> vestager: well, because then you don't find them. i don't-- i don't know anyone who goes to page four in their search results. the-- jokingly, you could say that this is where you should keep your secrets, because no one ever comes there. >> kroft: do you think this has been deliberate on google's part? >> vestager: yes, we think that this is done on purpose

: one of the featured speakers at the bloomberg global business forum's plenary session was margrethe vestagereuropean commission. she sat down with bloomberg's editor-in-chief john mickelthwait, and they discussed the extraordinarily timely issue of regulating big tech. ♪ margrethe: amazon is a -- it is a two-sided market. they have dual functions. they host the little guy, so he can enter into e-commerce. they provide a number of services, which allows also smaller businesses to be active in e-commerce and grab the opportunities, and that is great. they are also the big guy themselves. bookstore, you know, everything -- groceries, movies, the works. and they, of course, get all the data from the little guy. and we want to understand how this data is being used. because this is all about competition. because when we say innovation, well, competition is the most important driver for innovation, for you to stay ahead of your competitor. john: do you think the future is a bit like telecoms companies or maybe what happened with microsoft many years ago, where you have a platform company which is