 One kind can give us a carefully drawn picture of institutions and practices, general in that it applies to all activities of a certain kind of particular society or social setting, but still specialized to that society or setting.Although institutions and practices are intangibles, such a picture will be objective, a matter of fact, independent of the state of mind of the particular agents reported on.Approaching the economy from a different angle, another kind of fieldwork can give us a picture of the state of mind of economic agents (their true motivations, their beliefs, state knowledge, expectations, their preferences and values).