This document discusses concepts related to consumer utility and consumer equilibrium. It defines total utility as the satisfaction derived from consuming a commodity and marginal utility as the additional satisfaction from consuming one more unit. Consumer equilibrium exists when marginal utility per rupee equals price, meaning the consumer derives the most satisfaction for their money spent. The law of diminishing marginal utility and conditions for consumer equilibrium in a single commodity are explained. Graphs and a utility schedule are provided to illustrate these concepts.