The multinationals have artificially increased the price of goods coming to Australia for years by;
1. Enforcing rights management and getting monopolies which allow them to overcharge.
2. Lately DRM has been a sledgehammer to try and maintain this cosy overcharge. Any attempts at parallel imports are fought tooth and nail with the same fallacious arguments as the drug companies & cigarette companies use. No warranty, no standards,
3. Governments don't care. Almost guarantee this inquiry will get no-where.
4. Local retailers add to the issue by taking the overpriced imports from wholesalers / manufacturers and adding an overly large markup especially in on line retailing, the 10% GST is a minor component but they try and justify the same price as at bricks & mortar stores by claiming GST cost. Blaming the customer is easier than fighting the monopolies.
How Amazon can ship a book from the US to Australia , single unit not bulk so shipping cost higher , and sell it for half the cheapest on line book sourced here and 70% cheaper than the cheapest bookstore is beyond me. Likewise electronics etc.
Yes economies of scale make it cheaper to make & sell in the US etc but not that much. Most local manufacturing of these items have been outsourced to China years ago so the economy of scale isn't as significant as they claim.
Basically until the US government realise the real pirates are the multinational companies clamoring for DRM nothing will change. That won't happen in my lifetime.