Australia as a single geographic market for natural gas

Based on your reading of the case, respond concisely to the following question(s): (a) Is it appropriate to think of all of Australia as a single geographic market for natural gas?  If so, explain why.  If not, how would you define the relevant geographic market(s)?(b)Based on your geographic market definition(s) above, would you expect the Santos / SAGASCO  merger to increase market power?(c)Should regulators be concerned that Santos / SAGASCO would have a controlling share of the  Moomba processing facility?  Why or why not?