Simon Wren-Lewis starts with “the real damage that austerity has had on people’s lives” and then explains how “Austerity is a trap for the left as long as they refuse to challenge it.”
You cannot say that you will spend more doing worthwhile things, and when (inevitably) asked how you will pay for it try and change the subject. Voters may not be experts on economics, but they can sense weakness and vulnerability. If instead you restrict yourself to changes at the margin, you appear to be ‘just the same’.
The problem, of course, is that austerity is still inflicting its damage, especially in Greece, which is why workers, farmers, and others have taken to the streets in that country in recent days.