(a) As a response to the recent COVID-19 outbreak, the Commonwealth Government put in place lockdown restrictions. Using the dynamic AD-AS framework, analyse and demonstrate the impact of the COVID-19 pandemic on the level of output (or real GDP), unemployment, and inflation. (b) In response to the COVID-19 pandemic, in March 2020 the Commonwealth Government announced a fiscal stimulus which included income support for workers and businesses hit by the pandemic. Using the same dynamic AD-AS framework used in part (a), explain and illustrate the effect of the fiscal stimulus on the level of output (or real GDP), unemployment, and inflation. (c) Using the same dynamic AD-AS framework used in part (b), show what the impact of the fiscal stimulus would have been if Australia had no interactions in trade or finance with other economies (i.e. if Australia was a closed economy)