Sorry for the late reply.
My impression of trade liberalisation is that it often causes a negative effect upon economic growth, especially external stability. In some cases it can be a good thing, and my theory is this.
Trade liberalisation is the case where tax on imports(tariffs) and laws(quotas) are removed, promoting the case where overseas producers want to export more goods and services to, say, Australia. If Australia got more products(goods) from, for example, China at a lower prices dues to the reduction of taxes, the Australian traders can use that to their advantage and resell them for a much higher profit towards local consumers. Once high profits are gained, the local traders would want to employ more workers in order to expand their business, and by that they're increasing production, full employment and equity in income distribution. The increase in production leads to an increase in GDP (economic growth).
In relation to external stability, trade liberalisation wouldn't have much of an effect upon CAD, but rather with the exchange rate and NFD. More cheap imports to Australia means that local producers can use those imports to their advantage by making a new product out of them. An example could be using a cheap Chinese made tyre to assemble the rest of an Australian made car (not a real case with Ford, Holden and Toyota), where the producer is cutting costs per tyre compared to the case of using locally made tyres. The finished product would then be sold out to local consumers, and exported to overseas for a cheaper price due to cheaper resources used, hence promoting international competitiveness. An increase in exports should be likely, hence increasing the current account surplus and possibly terms of trade. As a result, more income is brought in Australia, thus reducing the budget expenses due to decreased welfare payments, therefore promoting a budget surplus, and ultimately, less foreign debt due to less relying on foreign loans.