The economy doesn't work like a corner store mate; its not all about profit but rather about economic activity.
Intelligent infrastructure adds to the economy ie: NBN with 5G to come, better roads/tunnells more efficient airports etc.
You owe your current wealth and welfare , mate, to what you say is a Ponzi scheme because immigration, increasing population , housing building & infrastructure to meet growing demand since WW2 has taken us from a chronically indebted country gutted by WW2 loss of life and resources to where we are today.
My issue with successive Lib Governments since 2013 is that while they gave the impression that the economy was going gangbusters on their watch , they managed to lift a national debt from $275 Billion coming out of a near recession to today;s $1 trillion.
That, IMO, is shit economic management, not the fault of an immigration program. Despite sprucing small government & small taxes, they increased the size of government and effectively raised taxes going forward by increasing debt to be paid in increased taxing later.
We have not yet seen the negative outcome of printing $5 Billion a month over the past 18 months and $4 trillion a month from October to who knows when. Were not the USA with the Reserve currency and guess what; our declared enemy hold most overseas AUD which they can dump once the time is right! Iron & coal has been traded in Aud/Yuan for the past 18 months necessitating China to hold AUD rather than settle in USD.
So i get back to the original question: how much income is anti-immigration advocates willing to forego by stopping Immigration?
Dont be shy, its a package deal based on our history post 1990. Our GDP has grown parallel to immigration since then and successive Governments have supported the proposition via their immigration policies that targeted immigration grows the economy. The logical corollary is that polulation shrinkage does the opposite..eh?