Ethics in online surveys

Objectives: - A. Identifying participation Types: Why are people answering online surveys: Ideally we seek to classify participants into a "Leisure" set and a "Labor" set. - B. Characterization of Types: How are labor and leisure types different: e.g. on wealth, age, political attitudes? - C. Incentives and Participation by Type: What are the differential effects of incentive on taking part in the survey across types? - D. Incentive and Response Quality by Type: What are the differential effects of incentive across types?