True/False (explain your answer with reasoning or a graph)

a) Is there always welfare loss under a monopoly?

b) Is welfare loss always lower under and oligopoly than under a monopoly?

c) If a game has a nash equilibrium it is a dominant strategy?

d) If a game does not have a nash equilibrium it does not have any equilibrium?

e) If you are a borrower and interest rate goes down, will you become a lender?

f) Does asymmetric information always lead to adverse selection?

g) Do we always moral hazard in insurance markets?