As is the case with many scientific advances, the emerging field of Neuroeconomics exploded when research scientists began sharing their research methodologies and tools with each other. In this case, neurobiologists and neurophysiologists are shattering some old economics theories. For instance, some research conducted with monkeys revealed that monkeys, like humans, reject inequality. They'll walk away from a reward if they feel they were treated unfairly. The fascinating thing about much of the research conducted in the field is that it has been brought about by systems thinking. Researchers began noticing the complex relationship between the variables (circular causality versus linear causality). For an overview, see "Economy of the Mind" put out by the The Center for the Study of Neuroeconomics at George Mason University.