Penny Wong (SA, Australian Labor Party, Minister for Finance and Deregulation) Share this | Hansard source

The government undertook very extensive modelling which underpinned the budget projections. That modelling was, of course, very extensive Treasury modelling which was based on estimates of long-term developments and international carbon markets as well as the assumption, consistent with government policy, that we would link with markets from 2015-16. The fact is that we put out there the government's package, including the very extensive modelling, and that has formed the basis not only of the budget but of the policy costings. The government always updates its costings in the usual way, which is something those opposite do not do. The government updates its costings in the usual way in the budget and in budget updates, and that is the approach the government will be taking.