continue to search every avenue to try to get to the bottom of it. >> sreenivasan: all right, josh lederman from the associated press, thanks so much. >> thanks. >> sreenivasan: stay with us, coming up on the newshour: 10 years in the making, ken burn's new documentary series, "the vietnam war." and fresh air host terry gross explains why she is on the radio and not television. but first, tech giants are increasingly under scrutiny from politicians, regulators and experts on the left and the right. some are concerned about their growing power, even calling them monopolies. and the tension keeps building: whether over privacy, politics or the displacement of workers by automation. yet their role in contemporary life isn't shrinking. and we, too, at the newshour have worked and collaborated with facebook, google and many other platforms. a new book zeroes in on some of these criticisms. economics correspondent paul solman has a conversation for his weekly series, "making sense." >> google, facebook, amazon, apple are among the most powerful monopolies in the history of humanity. >> reporter: