VJ difficult to get an accurate equation but then again it's amazing what smart & driven people & a whole lot of hard work
& persistence can accomplish
The variables that any equation would need to factor would be a measure of confidence , unemployment around the world , national debts , probability of vaccine within
certain time frames , effectiveness of vaccine , distribution of vaccine, rates of infection in your "travel to" countries - not easy but all need to be considered . Looks like
the surplus was calculated disregarding Covid & its effects
To get a measure of your surplus you do need to take into account Covid 19 and its effects both within Australia & overseas
As does the fact that Australian Federation of states governments will take a very very conservative view. & the heads of territories & States are just loving their moment on the
national stage - doing border control. Do you think they will give that up without a monumental fight ?
The Number of 190 if they just plucked that from how many who crewed the 747 - that is just pathetic , it is baby talk
"We got the 190 , we are all safe now , koombaya my lord koombaya" - well if that works for you goodluck