I think that there are several reasons for the price differences, although which are most important is probably both a matter of opinion and varies in different cases anyway.
1. Small market - this means imports are in small quantities (so overheads are spread over fewer sales), and tend to spend a long time on the shelf. 
2. Red tape. The amount of red tape to run a business in this country is very large compared to the USA, for example, and the cost of compliance is high. 
3. Lack of competition - this is largely a result of 1 + 2, but means that the local businesses can get away with gouging. Helped by exclusive sales licences with overseas suppliers who won't sell to Australia except through their dealer.
4. Dollar hedging - even though the dollar is high at the moment, a lot of the stuff on sale today was bought with overseas currency that was hedged when the dollar was lower, so the effective $A is a lot lower.
5. High interest rates. Very high interest rates in Australia by international standards (particularly US) means the cost of running a business is a lot higher here.
6. High cost of employment here. High wages and benefits plus other employment costs mean that the cost of running a business here is a lot higher.
Probably some other reasons I haven't thought of as well.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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