Neuroeconomics has produced a number of insights into economics, psychology, and neuroscience in its relatively short existence. Here, I show how neuroeconomics can inform these fields through three studies in social decision making and decision making under risk. Specifically, I focus on computational biases inherent in our daily decisions. First, using functional magnetic resonance imaging (fMRI), I examine how we make decisions for others compared to ourselves. I find that overlapping areas of the ventromedial...