Utilitarianism: Act, Rule, and Preference

Introduction

Welcome to the fourth module of our course. In the previous lessons, we thoroughly examined John Rawls's contractarian theory of justice, culminating in a critique of its core assumptions from both libertarian and communitarian standpoints. We saw how Rawls's deontological approach prioritizes rights and principles that are derived independently of their consequences.

Today, we pivot to an entirely different and highly influential framework for thinking about justice: consequentialism. Specifically, we will dive into its most famous variant, utilitarianism. Your background in economics and statistics will be particularly relevant here, as utilitarianism is fundamentally about aggregation and maximization—concepts at the heart of welfare economics and social choice theory. Its central idea is to construct a moral system by maximizing a single social good, typically defined as happiness or well-being.

Our learning outcome for this lesson is to distinguish between act, rule, and preference utilitarianism and their differing implications for justice. We will unpack these three major versions of the theory, exploring how they offer different answers to the question of what we ought to do and how a just society should be structured.

1. Act Utilitarianism: The Classical Formulation

The utilitarian project begins with a simple and radical idea, most famously articulated by Jeremy Bentham. It proposes that the morality of an action is determined solely by its consequences. The best action is the one that produces the greatest amount of good for the greatest number of people. This classical form is known as Act Utilitarianism.

To understand its core tenets, let's watch a short video that introduces the theory and its founder.

As the video explains, Act Utilitarianism directs us to assess each situation on a case-by-case basis. For any choice we face, we are morally obligated to choose the specific action that will maximize overall happiness or utility.

Bentham, with an ambition familiar to social scientists, even proposed a method for quantifying this utility: the "felicific calculus." It was an early attempt at a multi-attribute utility function, considering factors like:

• Intensity: How strong is the pleasure?
• Duration: How long will it last?
• Certainty: How likely is it to occur?
• Propinquity: How soon will it occur?
• Fecundity: What is the chance it will be followed by more of the same sensation?
• Purity: What is the chance it will not be followed by the opposite sensation?
• Extent: How many people are affected?

While its practical application is obviously fraught with difficulty, the calculus reveals the theory's core ambition: to create a scientific, objective basis for morality and legislation.

However, as the organ donor dilemma starkly illustrates, Act Utilitarianism has deeply unsettling implications for justice. It seems to permit, and even demand, actions that violate fundamental rights and principles of fairness if doing so maximizes the aggregate good. This is often called the "tyranny of the majority" problem: the happiness of the many can outweigh the profound suffering of the few.

2. Rule Utilitarianism: A Response to the Problems of Acts

The troubling implications of Act Utilitarianism led philosophers like John Stuart Mill to propose a modification: Rule Utilitarianism. Instead of evaluating individual acts, this approach evaluates the consequences of adopting general rules. An action is right if it conforms to a rule that, if universally followed, would produce the greatest amount of good.

Let's continue with the same video, which draws this contrast very clearly.

The key insight of Rule Utilitarianism is that while a specific act of injustice (like framing an innocent person) might produce more utility in an isolated case, a general rule permitting such acts would lead to disastrous consequences. It would erode trust, create widespread fear, and ultimately decrease overall happiness. Therefore, a rule utilitarian would advocate for upholding rules like "do not kill the innocent" because the utility of that rule is very high.

Mill also refined utilitarianism by introducing the idea of higher and lower pleasures. He argued against Bentham's purely quantitative view, suggesting that intellectual and moral pleasures (higher) are intrinsically more valuable than purely physical ones (lower). "It is better to be a human being dissatisfied than a pig satisfied; better to be Socrates dissatisfied than a fool satisfied." This qualitative distinction was an attempt to make utilitarianism less of a "doctrine of swine."

However, Rule Utilitarianism faces its own dilemma, as the video touches upon:

• Strong Rule Utilitarianism: If the rules can never be broken, the theory seems to devolve into a form of "rule worship," losing its consequentialist flexibility. It starts to look more like the deontology of Kant.
• Weak Rule Utilitarianism: If the rules can be broken whenever breaking them produces more utility, then the theory seems to collapse back into Act Utilitarianism. The rule becomes a mere "rule of thumb."

A more sophisticated approach, proposed by R.M. Hare, is Two-Level Utilitarianism. This model suggests that we should rely on simple, intuitive moral rules (Rule Utilitarianism) in our everyday lives. However, in novel or complex situations where rules conflict, we can ascend to a "critical level" of thinking and engage in a more direct, act-utilitarian calculation. This pragmatic synthesis attempts to get the best of both worlds: the stability of rules and the flexibility of acts.

3. Preference Utilitarianism: Moving Beyond Happiness

Both act and rule utilitarianism are typically hedonistic—they define the "good" as pleasure or happiness. But is happiness the only thing people value? A more modern adaptation, Preference Utilitarianism, proposes a different goal: maximizing the satisfaction of individual preferences or interests.

The following reading explains this shift and its motivation.

The move to preferences is a significant one. It is driven by thought experiments like Robert Nozick's experience machine. Many people would decline to be plugged into a machine that guarantees a life of maximal pleasure, preferring instead to live an authentic life in contact with reality, even if it involves less happiness. This suggests we have preferences—for truth, for achievement, for real relationships—that go beyond simply feeling happy.

Preference Utilitarianism, championed by philosophers like Peter Singer, aims to respect this by making the satisfaction of these informed preferences the goal of our moral calculus.

Implications for Justice:

• Respect for Autonomy: This version is arguably more aligned with a liberal conception of justice that respects individual autonomy and diverse life plans. It doesn't impose a single definition of "the good life" (i.e., happiness) but rather seeks to satisfy the goals people set for themselves.
• New Problems: This approach raises new difficulties. How should we handle "bad" or antisocial preferences (e.g., a preference for others to suffer)? How do we aggregate and weigh conflicting preferences? This brings us back to the core challenges of social choice theory that you explored in your studies of economics, famously highlighted by Arrow's Impossibility Theorem.

Conclusion

Today, we have mapped the main branches of utilitarianism, a powerful consequentialist framework that offers a systematic way to think about morality and justice. We have seen how it evolves in response to its own internal problems.

Key Takeaways:

• Act Utilitarianism evaluates each action based on its direct consequences, aiming to maximize utility in every specific case. Its flexibility comes at the cost of potentially sanctioning acts that conflict with common-sense justice and individual rights.
• Rule Utilitarianism shifts the focus to the utility of general rules, providing a framework that can uphold rights and principles of justice by arguing for their long-term benefit to society. It faces the challenge of being either too rigid ("rule worship") or collapsing back into act utilitarianism.
• Preference Utilitarianism moves beyond a purely hedonistic view, aiming to satisfy the informed preferences of individuals. This aligns more closely with respecting individual autonomy but introduces new complexities in aggregating and evaluating different kinds of preferences.

Each of these theories provides a different lens through which to analyze questions of justice, particularly in public policy where trade-offs are inevitable. The utilitarian demand to aggregate the good of all individuals remains both its greatest strength and, as we will see, its greatest vulnerability.

Preview of the next lesson:

We will confront the most fundamental challenge to the entire utilitarian project: the 'separateness of persons' objection. This critique, famously leveled by John Rawls and others, argues that by aggregating utilities, utilitarianism fails to respect the inviolability and unique moral status of each individual, treating them as mere containers for welfare rather than as distinct persons.