Scott Sumner's latest information transfer model
It looks like Scott Sumner has written down the models r : N ⇄ M0 and r : N ⇄ MB
http://www.themoneyillusion.com/?p=31387
He just needs to plot log r.
PS Here was the previous one:
http://informationtransfereconomics.blogspot.com/2015/08/scott-sumners-information-equilibrium.html