‘Take the money and run’ explains the ‘basic trust game’ which is an economic experiment asking participants to make decisions of trust without communicating with others. This test tells researchers that trust is risky; trust can benefit the truster; when one person trusts, two people benefit; people don't always act in self-interest; and people don't always expect others to follow the path of self-interest. These sorts of experiments suggest that when people work together trustingly, they can get a lot done to the benefit of everyone. They also allow researchers to put numbers on trusting and trustworthy behaviour. They don't explain the sort of trust we have for family and friends, or even institutions.