Utilitarianism — Study Guide

01 — Foundation

What is Utilitarianism?

An ethical theory that judges the morality of an action solely by its consequences. If an action increases total happiness, it's good. If it causes harm, it's bad. Simple.

⚖️ Jeremy Bentham

Founded utilitarianism. Developed the "hedonic calculus" — literally measuring pleasure vs. pain.

📖 John Stuart Mill

Refined the theory. Argued quality of happiness matters too — not just quantity.

🧠 Memory Hook — "H = A²"

"Happiness = Advantage + Absence of pain"

All the synonyms in one shot:

Happiness Advantage Benefit Good Pleasure Profit Unhappiness Disadvantage Cost Evil Pain

02 — The Core Principle

The Principle of Utility

Also called The Greatest Happiness Principle.

Right Action = Action that produces the most happiness
for the greatest number of people affected

                    👁 Focus on OUTCOMES

                    What matters is the result of the action, not the intent or
                        attitude behind it.
                

                    🚫 Not about intentions

                    You could have good intentions but if the outcome causes harm → it's
                        wrong.
                

✓

Benefits

⚖️

✗

Harms

Weigh the total benefits against the total harms across ALL affected parties

03 — Two Types

Type 1

Act Utilitarianism

Evaluate each individual action on its own. Ask: "Will THIS specific act produce the most good right now?"

🔍 Judge act-by-act, case-by-case

Type 2

Rule Utilitarianism

Follow rules that, when universally followed, produce the greatest happiness overall.

📋 Judge rules, not individual acts

04 — Act Utilitarianism Deep Dive

Act Utilitarianism

An act is morally acceptable if and only if its consequences produce the greatest good for the greatest number of people affected.

📍 Real Case Study — Highway Construction

Compensate 150 homeowners−$20M

Construction costs (taxpayers)−$10M

Environmental impact (animal habitats)−$1M

Savings to drivers over 25 years+$39M

Net result+$8M (benefit wins)

✓ Build the highway — total benefit ($39M) > total cost ($31M)

✅ Case FOR Act Util

Focuses on real, practical happiness
Intuitive — most people think this way
Considers everyone affected

❌ Case AGAINST Act Util

Unclear who to include in calculations
Can justify breaking promises
Ignores our sense of duty/obligation

⚠️ The Promise Problem — Why Act Util Gets Tricky

X promised Y something → Keeping promise = 1,000 units of good for Y
Breaking promise = 1,001 units of good for Z
Act Util says: Break the promise! → But this feels wrong 🤔

05 — Rule Utilitarianism Deep Dive

Rule Utilitarianism

An action is right if it follows a rule that leads to the greatest good. The correctness of a rule is determined by how much good it brings when universally followed.

"Is it OK for everyone to do this?"
Not just: "Is it OK for me?"

✅ Case FOR Rule Util

Easier to apply — just follow the rule
No need to calculate every decision
Rules survive exceptional situations
Avoids the bias of "what's good for me"
Appeals to a broad cross-section of society
Solves the promise problem ✓

❌ Limitation

Rules may sometimes produce less good in specific edge cases
Requires agreement on which rules to follow

06 — Side-by-Side Comparison

Act vs. Rule — At a Glance

Dimension	⚡ Act Utilitarianism	📋 Rule Utilitarianism
Unit of evaluation	Each individual act	The rule behind the act
Question asked	"Does THIS act produce most good?"	"Does following this RULE produce most good?"
Promise scenario	Break it if it gives 1 more unit of good	Keep it — the rule of keeping promises gives more good long-term
Bias risk	Higher — each decision is isolated	Lower — asks "is it OK for everyone?"
Ease of use	Harder — must calculate every time	Easier — just follow the established rule

07 — Common Confusion: Rule Util vs. Kantianism

Both Follow Rules — But Why?

Rule Utilitarianism and Kantianism both use rules, but they arrive at them very differently.

📋 Rule Utilitarian

Follows a rule because its universal adoption produces the greatest happiness.

Focus: Consequences

⚖️ Kantian

Follows a rule because it aligns with the Categorical Imperative — treat humans as ends, never merely as means.

Focus: The will / intention

🧠 Memory Hook

"Util looks at WHERE you end up. Kant looks at WHY you're going."

08 — Quick Review Flashcards

Test Yourself

👆 Click any card to reveal the answer

What does "utility" mean?

The tendency of an object/action to produce happiness or prevent unhappiness for an individual or community.

Who founded utilitarianism?

Jeremy Bentham and John Stuart Mill.

What does Act Utilitarianism evaluate?

Each individual action based on whether it produces the greatest good for the greatest number affected by that specific act.

What does Rule Utilitarianism evaluate?

Rules — an action is right if it follows a rule that, when universally followed, leads to the greatest good.

What is the main criticism of Act Utilitarianism?

It can justify breaking promises or duties if doing so produces even 1 more unit of good — ignoring our innate sense of obligation.

How does Rule Util solve the promise problem?

The rule "keep your promises" produces more good overall when universally followed, so we keep promises even if breaking one might give slightly more good this one time.

What's the key difference between Kantianism and Rule Util?

Rule Util follows rules based on consequences (what produces most happiness). Kantianism follows rules based on the Categorical Imperative (treat humans as ends, not means).

Another name for the Principle of Utility?

The Greatest Happiness Principle.

🗺 Big Picture Summary

STEP 01

Identify the action

What are you considering doing?

STEP 02

Who is affected?

List all individuals/groups impacted.

STEP 03

Calculate consequences

Estimate total benefits vs. total harms for everyone.

STEP 04

Choose Act or Rule

Act: judge this act alone. Rule: does a universal rule apply?

STEP 05

Moral verdict

Net benefit → morally right. Net harm → morally wrong.

09 — Practice Questions

Q1 — Definition & Principle of Utility

State the Principle of Utility in your own words. Why is it also called "The Greatest Happiness Principle"? Explain why utilitarianism focuses solely on outcomes and not on the intent behind an action. Give one example where good intentions lead to a bad outcome.

Q2 — Bentham vs. Mill

Jeremy Bentham and John Stuart Mill both founded utilitarianism but differed in one key way. What refinement did Mill add to Bentham's original framework? Provide an example that illustrates why this refinement matters (e.g., choosing between two options with the same quantity of happiness but different quality).

Q3 — Act vs. Rule Utilitarianism

A doctor has five terminally ill patients who will die without organ transplants. A healthy patient comes in for a routine check-up. The doctor could save the five by sacrificing the one.

a) What would Act Utilitarianism conclude, and why?
b) What would Rule Utilitarianism conclude, and why?
c) Which verdict do you find more ethically defensible, and what does this reveal about the limitations of Act Utilitarianism?

Q4 — The Promise Problem

You promised a colleague you would review their report by Friday. On Thursday, you receive a more urgent task that benefits the company by 1,001 units of good, while keeping your promise only benefits your colleague by 1,000 units.

a) What does Act Utilitarianism say you should do?
b) What does Rule Utilitarianism say, and on what grounds?
c) Which approach better captures our intuitive moral sense about promises, and why?

Q5 — Cost-Benefit Analysis

A software company is deciding whether to delay a product launch by 3 months to fix a known but non-critical security flaw. The delay costs $2M in lost revenue. Not fixing the flaw risks exposing 50,000 users to data theft, estimated at $60 per user on average in damages.

Using the Act Utilitarian cost-benefit approach, calculate whether the company should delay. Show your working and state your conclusion.

                Hint: Compare total estimated harm (users × damage per user) vs. cost of delay.
            

Q6 — Rule Util vs. Kantianism

Both Rule Utilitarianism and Kantianism involve following rules, yet they are fundamentally different theories. Using the memory hook "Util looks at WHERE you end up. Kant looks at WHY you're going," explain this difference in the context of the following dilemma:

A government policy forces companies to share user data with law enforcement. A Rule Utilitarian and a Kantian both oppose it — but for different reasons. What are those reasons?

Q7 — Applying the 5-Step Framework

A social media platform is deciding whether to use an algorithm that maximizes user engagement (increasing advertising revenue by $500M/year) but is known to promote anxiety-inducing content to teenagers.

Apply the 5-step utilitarian framework (Identify → Who affected → Calculate → Act or Rule → Verdict) to this decision. Identify all affected parties and estimate whether the net result is beneficial or harmful.

Q8 — Comparison: Utilitarianism vs. Deontology

Compare Utilitarianism and Deontology (Kant) on four dimensions: (1) what determines the morality of an action, (2) how they handle promises and duties, (3) whether they can justify sacrificing one person for many, and (4) practical ease of application. Present your comparison in a structured format.