I am sorry, but there were four typos on p. 14 of the notes for 14 Sep. The fraction (1-A) divided by (1-tau)(1-pi) appears twice. The factor (1-pi) in the denomitator should be (1+pi). After the fraction, there is a bracketed expression pho+delta(1+pi)+pi. The final term should be minus pi, not plus pi. A new version is now available. -DL