To get a free copy of the Infectious Generosity book, visit ted.com/generosityWhat if the world’s biggest problems could be solved with just some simple math? Natalie Cargill, the founder of strategic giving consultancy Longview Philanthropy, works on finding funding for the most impactful...

To get a free copy of the Infectious Generosity book, visit ted.com/generosity   How much happiness could be gained if more people had access to wealth? Does the relationship between spending money and happiness change when people are in different economic classes? And if chosen randomly, what...