Fairness and efficiency are two classical and connected topics in economics. They have become well known, perhaps due to Adam Smith’s two influential works: The Theory of Moral Sentiments (1759), which highlights a concern for fairness concern as part of morality, and The Wealth of Nations (1776), which underlines a concern for efficiency. However, during the rapid development of economics, fairness has received disproportionately less attention than efficiency. As a result, many people, including some economists, have incorrectly understood that economics as a subject no longer cares about fairness. The primary objective of this thesis is to dispel this misperception. We would argue here that, similar to efficiency, fairness is an important factor for both social and individual decisions, and sometimes its effect can be determined. Written in a three-paper format, this thesis explores fairness from three different angles. These angles cover the broad areas of how theoretical economists model fairness in social choice theory, how the general public perceive distributive fairness, and how people implement their fairness norms in making real-life donations. This multidimensional exploration is believed to be crucial to a comprehensive understanding of fairness.