This document summarizes key concepts in managerial economics including: - Cardinal utility which assumes utility can be quantitatively measured in utils. Total utility is the sum of utility from consuming different units of a good. - Limitations of the cardinal utility approach include utility being subjective and non-additive. - Ordinal utility which ranks preferences rather than attaching quantitative measurements. - The law of demand which states that as price increases, quantity demanded decreases, assuming other factors remain unchanged. - Demand schedules and demand curves which graphically depict the relationship between price and quantity demanded.