Economic laws are statements of general tendencies that describe unchanging relationships between economic events under certain circumstances. They are postulated by economists based on observation and analysis, and include laws like the Law of Demand, Law of Supply, and Law of Diminishing Marginal Utility. Economic laws are less exact than natural laws, are essentially hypothetical, relative, and qualitative rather than quantitative. They apply on average under normal conditions and describe human behavior that can be measured in terms of money.