The ideas of Keynes are responsible for the last decade of economic disaster around the planet.
Austerity has been proven to work over and over again.
Just ask Sweden, they're a proof case that managed austerity works exceptionally well.
http://www.bloomberg.com/news/2012-06-06/booming-sweden-s-fr...
Or ask Latvia, a recent case of successful austerity.
http://www.nytimes.com/2013/01/02/world/europe/used-to-hards...
http://www.cnbc.com/id/100558455
However, Latvia employed REAL austerity. They cut deep. Not the slow motion - we don't really want to cut anything - train wreck that people like Krugman are claiming is austerity (see: Greece or Spain).
Over the last 30 years China has radically reduced its public to private spending ratio. It has been one long managed austerity process. No surprise it has boomed accordingly as private capital was left free to be invested to actually grow the economy, which is not something consumption based Keynesian policies can accomplish.
Most government spending doesn't create wealth, sustainable jobs, and it doesn't produce anything. It's consumption paid for by production. The more you tip the balance toward government consumption, the more disastrous the consequences. Greece, Italy, France, the US, Portugal, Spain, Japan, Britain, etc. are all obvious examples of following Keynes policies the last few decades. It has led to destruction.