Dear Undercover Economist : The very best letters from the Dear Economist column

Are there tangible benefits in flossing? Is it wrong to fake orgasms? What does the perfect online dating ad look like? Should we bother doing the ironing? Is it really impossible to buy the perfect Christmas gift? (Other than this book, of course.) Economists might not be the first people you would think of to give you advice on such diverse areas as parenting, the intricacies of etiquette or the dark arts of seduction.

But for years bestselling author Tim Harford has been doing just that: answering the most challenging questions in his brilliant column, where he uses the tools of economics to give practical advice about everyday dilemmas, conundrums and concerns.

From family rows and the stock market to buying socks or speed dating, you'll find within these pages a witty - and of course rational - explanation for almost everything you ever wanted to know about life.