excelsior, the NBN is a road, commerce etc. is transported back and forth along the Internet the same as a road.
"...Where has $320 billion gone?...excelsior"
It's $190 billion, not $320 billion. Costello documented $67b debt and the current debt is $257b, an increase of $190 billion.
Total Commonwealth Government Securities on Issue - $257,378m http://www.aofm.gov.au/
http://archive.treasury.gov.au/documents/1321/PDF/PEFO_2007_Final.pdf Costello's 2007 PRE-ELECTION ECONOMIC AND FISCAL OUTLOOK. It has Australia's total debt at $66.98 billion in 2007-08