You are right Trish the "borrowing" is mainly QE which is not really borrowing as it would be borrowing from ourselves and would be like me borrowing from me. It can devalue the currency however. What JC is saying is that we must move to using QE to expand in the way that Jen explains.
What do those that like the idea of depriving everyone of all but the absolute minimum of state provision think it will do. As whitewave says, austerity is the wrong word and is used to make us feel there is no alternative and that it is about making the best of the little available. This is not the situation we are in. The reason little will be available is only because the government has decided it will be so - it is not the true situation. This is not austerity and, indeed, again as ww says it is holding up the example of the war and is an insult to those who scrimped and saved because they had no choice.
What GO and DC are doing is putting the whole country on a starvation diet. Of course, there are those who, in spiv like manner, can by their way to more but there are also those who will be starved, both actually and of opportunity and hope.