Theory of Consumption (law of diminishing marginal Utility)

Cardinal Utility & Consumer Behavior
📌 The concept of Cardinal Utility focuses on quantifying satisfaction through calculation, specifically using the Law of Diminishing Marginal Utility.
📉 As consumption quantity increases, the Marginal Utility (MU) of each additional unit decreases, even if Total Utility (TU) continues to rise at a diminishing rate.
⚖️ Once MU reaches zero, Total Utility is at its maximum point; consuming beyond this point leads to negative utility and a decline in total satisfaction.
🧠 Psychological studies show that repeating consumption of the same item reduces its subjective value, eventually leading to a loss of interest or potential physical discomfort.

Budget Constraints & Consumption Strategy
💰 A consumer’s purchasing power, or budget constraint, is defined by the equation:
$$Income = (P_x \times Q_x) + (P_y \times Q_y)$$
where $P$ represents the price and $Q$ represents the quantity of goods X and Y.
🔄 Consumers aim to maximize utility by allocating their limited resources (income) across different goods until the utility gained from the last dollar spent on each good is equalized.
🚫 In basic microeconomic theory, the concept of savings is excluded; the model assumes all income is spent to achieve maximum utility across the chosen goods.

Academic Administration & Course Expectations
🗓️ The course will shift significantly toward online delivery to cover the majority of the syllabus, allowing in-person sessions to focus exclusively on complex topics and problem-solving.
🎓 Students must complete and submit all assignments by the specified deadline; failure to do so will result in being blocked from the submission portal.
📝 A quiz on the "Elasticity" chapter is scheduled for next Thursday; students are expected to prepare accordingly to ensure better performance than previous assessments.
💻 Technical issues with Zoom and login credentials are being addressed; students should ensure their software is updated to the latest version to avoid access errors.

Key Points & Insights
➡️ Maximize Utility: To achieve optimal satisfaction, adjust the consumption of goods until the marginal utility per dollar spent is equal across all items.
➡️ Monitor Progress: Previous assessment results were lower than expected (only 30% accuracy on some topics); students must review foundational concepts like Consumer Surplus to improve.
➡️ Stay Proactive: Since the final exam content will cover everything from the start of the semester, students should not treat online classes casually, as cumulative material will be difficult to manage later.

📸 Video summarized with SummaryTube.com on Apr 02, 2026, 16:30 UTC