Google. Click on the screen capture at the right and you'll see searches spiked around the same time long term US Treasury bond yields dropped very quickly.US Treasury rates have dropped recently and it appears to me they may continue declining. How low can they go? I have no idea but I thought it would be interesting to look at when 'deflation' was a popular search term on
I wonder if we'll get another spike in search traffic for deflation if bond yields fall again . . .