A hasty generalization fallacy is a claim made on the basis of insufficient evidence. Instead of looking into examples and evidence that are much more in line with the typical or average situation, you draw a conclusion about a large population using a small, unrepresentative sample.

Due to this, we often form a judgment about a group of people or items based on too small of a sample, which can lead to wrong conclusions and misinformation.

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Hasty generalization fallacy example

You have a transit flight via Frankfurt Airport, Germany. On the way to your gate, several passengers hastily bump into you without even apologizing. You conclude that “Germans are so rude!”

Hasty generalization fallacy is also called overgeneralization fallacy, faulty generalization, and argument from small numbers.

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What is a hasty generalization fallacy?

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A hasty generalization fallacy occurs when people draw a conclusion from a sample that is too small or consists of too few cases.

When we try to understand and come up with a general rule for a situation or a problem, the examples we use should be typical of the situation at hand. If we only consider exceptional cases or just a few instances of a certain phenomenon, we commit a hasty generalization fallacy. In other words, we jump to conclusions.

In the previous example, you don’t even know whether the passengers you crossed paths with were even Germans. They could have been from any country in the world, and had they been Germans, it would have been unreasonable to characterize an entire population based on the behavior of a few passengers.

Because the conclusion is not logically justified by sufficient evidence, hasty generalization is a form of logical fallacy or reasoning error. More specifically, it is an informal fallacy: the problem lies in the content of the argument, not its structure (formal fallacy).

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How does hasty generalization fallacy work

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An argument based on a hasty generalization moves from particular statements to a general statement. However, inferring a conclusion about an entire class of things from inadequate knowledge about some of its members is a logical leap.

Hasty generalization usually follows this pattern:

1. We take a small sample from a population, the sample usually being our own experiences.

2. We draw a conclusion based on this small sample.

3. We extrapolate our conclusion to the population.

In other words, “if it’s true in this case, then it is true in all cases.”

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Hasty generalization fallacy example

“I’ve met two people in Greece so far, and they were both nice to me. So, all the people I will meet in Greece will be nice to me.”

Here, the speaker makes an absolute statement. In other words, they imply zero error margin (“all the people”). For this to be true though, we would have to sample every single person in Greece, not just two people, which of course is not possible. Even if the claim turns out to be correct, it is not well reasoned.

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Why does hasty generalization fallacy matter?

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In statistics, hasty generalization fallacy is often the outcome of sampling bias (i.e., when one uses a sample that does not represent the entire population). This can be accidental or intentional, like in the case of misleading statistics.

Hasty generalizations based on the misuse of statistics make their way into advertisements, political debates, and the media, creating false narratives or serving as a marketing tactic.

Because we are inclined to draw conclusions from our experiences, hasty generalizations usually crop up in everyday conversations. This is often the case when we make absolute claims on the basis of our (narrow) experience or an isolated incident.

Due to this, hasty generalizations about individuals and the groups they belong to can lead to various forms of stereotyping, like outgroup bias. The problem is that our experience provides only a small sample size, which is insufficient to support most generalizations.

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Hasty generalization fallacy examples

Because of the constant need for new, attention-grabbing content, the media often fall prey to hasty generalization fallacies.

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Hasty generalization fallacy example in the media

How the media report on medical studies is a prime example of hasty generalization fallacy. One day a news show may quote studies claiming that coffee is good for your health, while another day they may find a different study claiming the exact opposite.

What happens very often is that these shows report on preliminary research where small samples were used. These studies are not supposed to be conclusive. Instead, they direct researchers to topics that require further investigation. Future studies are needed to either confirm or refute these preliminary findings.

Journalists are usually not aware of that and jump to conclusions, making absolute statements like “coffee is bad for you” (although how much coffee and who is “you” also needs further elaboration). As a result, they contradict themselves (sometimes even from one week to the next).

Hasty generalization fallacies can be used intentionally as a persuasion technique.

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Hasty generalization fallacy in advertising

Several years ago, a Colgate advertisement claimed that “More than 80% of dentists recommend Colgate.” Upon further scrutiny, the Advertising Standards Authority (ASA) of the United Kingdom found the claim to be fallacious and ordered Colgate to remove it.

The rationale behind this decision was that consumers would assume that 80% of dentists recommend Colgate, and only 20% other brands. However, this was not the case: the survey question allowed participants to select several brands, not just one, as the advertisement implied.

This is an example of hasty generalization because the ad reaches a conclusion (the majority of dentists recommend Colgate) that is not justified logically by objective or sufficient evidence.

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Frequently asked questions about the hasty generalization fallacy

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Nikolopoulou, K. (2023, April 26). Hasty Generalization Fallacy | Definition & Examples. Scribbr. Retrieved May 6, 2024, from https://www.scribbr.com/fallacies/hasty-generalization-fallacy/

Muniz, M. J. (2018). Hasty Generalization. En John Wiley & Sons, Ltd eBooks (pp. 354-356). Wiley. https://doi.org/10.1002/9781119165811.ch84

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