Why are clocks in Germany always correct while those in Brazil are frequently wrong? Why are Singaporeans jailed for selling gum? Why do women in New Zealand have three times the sex of females worldwide? Why was the Daimler-Chrysler merger ill-fated from the start? And why does each generation of Americans give their kids weirder and weirder names?

Curious about the answers to these and other questions, award-winning social psychologist Michele Gelfand has spent two decades studying both tight societies (with clearly stated rules and codes of ethics) and loose societies (more informal communities with weak or ambiguous norms). Putting each under the microscope, she conducted research in more than 50 countries and collaborated with political scientists, neuroscientists, computer scientists, anthropologists and archaeologists. Her fascinating conclusion: behaviour seems largely dependent on perceived threats. It's why certain nations seem predisposed to tangle with others; some American states identify as 'Red' and others as 'Blue'; and those attending a sports contest, health club or school function behave in prescribed ways.

Rule Makers, Rule Breakers reveals how to predict national variations around the globe, why some leaders innovate and others don't and even how a tight vs. loose system can determine happiness. Consistently riveting and always illuminating, Michele Gelfand's book helps us understand how a single cultural trait dramatically affects even the smallest aspects of our lives.