Mr TURNBULL (Wentworth—Prime Minister) (14:47): As my friends behind me said, 'Nice tie, silly question'—that is the best comment one can make to the shadow minister. I can see the honourable member has now retreated from his ill-conceived efforts to undermine the property market and is now moving onto other matters. As far as the government are concerned today, we are focused on the big issue of the day: the defence of Australia; the defence white paper. That underpins all of our economic plans—every single element of our future prosperity. Yes, it depends on innovation. It depends on competition. It depends on greater participation. It depends on kids learning STEM subjects at school and coding. It depends on greater productivity. It depends on the reforms that we have been introducing— Ms Owens interjecting— The SPEAKER: The member for Parramatta is warned. Mr TURNBULL: responding to the Harper review. It will depend on important reforms to this place, including the reforms to the Senate voting system, which Labor used to support but now apparently opposes. All of these reforms are vitally important. But underpinning all of that is security and stability in our region. That is the absolute, necessary element for our future prosperity. And that is why our investment in the defence plan, set out in the defence white paper, underpins the security of Australia and— Mr Burke: Mr Speaker— The SPEAKER: Has the Prime Minister concluded his answer? Mr Turnbull: I have. The SPEAKER: The Prime Minister has concluded his answer. Mr Albanese: It's a serious question. Mr Pyne: It was a stupid question. Mr Albanese interjecting— The SPEAKER: The Leader of the House and the member for Grayndler are delaying question time.