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Mental illness reduces national income by about 4\%, and yet we only spend about 13\% of our health budget and about 5\% of our medical research funds on tackling the problem.  As an economist who writes a fair bit on mental health, I regularly trot out statements like this about how costly mental health problems are to society and how the under-provision of services is grossly inefficient. To some the point may now seem obvious and trite. As evidence grows ever more compelling, government policy slowly shifts in response. One success story is the Improving Access to Psychological Therapies (IAPT) initiative, which has greatly improved the availability of evidence-based treatment for some of the most prevalent mental health problems in the UK. Yet in many cases we still await adequate action from the government and decision-makers. Two key players in getting IAPT into government policy were Richard Layard - an economist - and David Clark - a psychologist. In their new book \textit{Thrive: The Power of Evidence-Based Psychological Therapies}, Layard and Clark demonstrate the need for wider provision of cost-effective mental health care in the UK. UK.\cite{layard2014thrive}  The book starts with a gentle introduction to mental illness; what it is, who suffers, the nature of treatment. This will give any reader a way in, with an engaging set-up for what follows (though with one third of families including someone with a mental illness, most people will find the topic relatable). The opening chapters go on to dig deeper into these questions; do these people get help, how does it affect their lives and what are the societal impacts? These chapters serve as a crash course in mental health and though the style is conversational and easily followed, on reflection you'll realise that you've absorbed a great deal of information about mental health. More importantly, you’ll have a deeper understanding. This isn't simply because of the number of statistics that have been thrown at you, but because of the personal stories and illustrations that accompany the numbers. This forms the first half of the book - `The Problem' - which encourages the reader to start questioning why more isn't being done. Economists may at times balk at the broad brush strokes in considering the societal `costs' of mental health problems, but the figures are nevertheless startling.