All right here are a couple.

a) Regarding question 1: I can get something that has all the same terms as eq2 above (note: z1 = zt and z2 = zt+1) by taking the ln of the profit equation ((9.10) in book) and solving for N. The only problem is it also has terms with 'I' and 'pi' in them. How do I get rid of those?

b) From question 3: what is the intuition for c going down when w goes up (eq4 above)?

c) If someone could give me a hint as to what the deal is with question 4, that would be great too.