One potential confound is that the rewards may not scale right: the older you are, often the wealthier you are. A kindergartner might be thrilled to defect for $1, while an old person can barely be troubled to stoop for a $1 bill.
One potential confound is that the rewards may not scale right: the older you are, often the wealthier you are. A kindergartner might be thrilled to defect for $1, while an old person can barely be troubled to stoop for a $1 bill.