This is not so much a self-help book, rather a study of the science of happiness – what it is, how it can be measured and how it can be increased.
The author is an economist so the topic is dealt with in a drier, more factual way than usual books about the subject. He looks at how whole societies can improve their citizens’ general contentment – comparing the relative success of Scandinavian nations with those of the US & UK.
The main crux of the issue seems to be that once a certain level of income has been reached (US$20K+), equality of wage and working towards a common good are far more likely to make citizens happy than an ever-increasing wage packet. He argues that we should scale-down the quest for material status and evolve beyond our instinctive urge for survival. Only then, can we begin to improve the Western state of mind.
Without being an expert, I would say that this is essentially a socialist viewpoint that has been modified to fit in with modern society. I would love to see it happen, but I am sceptical. It’s still an important read though and tackles this trendy issue from a different & interesting angle.