let's bring in what then pr professor jeremy siegel. great to see you as always let's start on the yield move, if we can, and how it's so pronounced, continues last week's already pronounced move, 118, can that go on? >> i think if it goes on a bit longer, think it shows what a great hedge asset those treasuries are people move opposite the risk assets, move opposite the stock market, the vix and the treasuries now have been -- people are trying to say, i'm going to go into treasuries, whenever the marketfalls the delta variant is more threatening internationally, clearly an emerging markets color not well vaccinated at all, but even in european markets, where astrazeneca doesn't seem to be as effective as the mrna vaccines of the u.s., this delta variant is probably going to cause the last wave in the u.s. when it's over, maybe a month, six, eight weeks, i think the u.s. will probably have have achieved what we call herd immunity, going into the fall. so i don't see u.s. economic growth slowing i do see an effect on world economic grow