How We Reason: The Psychology Behind Everyday Decisions

Imagine this scenario: You are on an e-commerce website, comparing two similar products, a pair of headphones. One of them is advertised as “best seller,” which means that it appears in first place on the webpage and gets a slightly better rating than the second model. However, the latter model is cheaper and offers nearly the same features as the “best seller.” After spending a few moments scanning through these models, you decide to choose the “best seller” option, which seems logical and justified. In fact, this situation represents a typical decision-making practice that people face in their daily lives.

Reasoning is one of the important processes during decision-making, which implies making conclusions based on available information. Deductive reasoning involves moving from a general principle to a particular situation. Therefore, if there is a rule stating that higher ratings mean higher quality, one would conclude that buying the best-rated headphones is a logical step. Inductive reasoning occurs when general conclusions are drawn from specific experience. For instance, if some highly rated products one buys prove to be good, it could make one believe that the rating system is reliable. In practice, inductive reasoning is common in day-to-day life since people tend to make decisions based on limited information in order to save time and energy.

The sheer number of alternatives in a choice set makes it difficult for the human brain to assess all details. People, therefore utilize heuristics, which are mental shortcuts,  to make judgments. Heuristics can take the form of rating systems, popularity, or even product positioning on a web page. It is likely that a product that is marked as a 'best-seller' will seem like the most sensible choice even without further analysis.

This is where cognitive biases become important. Confirmation bias is the tendency to focus on information that supports what we already believe while ignoring information that challenges it. If we already think a well-known brand is reliable, we are more likely to notice positive reviews and overlook negative ones. This reinforces our initial belief, even when the overall evidence is mixed or unclear.

Another common bias is the representative bias. This occurs when we judge something based on how closely it matches a familiar pattern rather than on actual evidence. A well-designed, highly rated, and professionally marketed product would be more appealing since it fits the perception of what a quality product is. However, if there is another product that works even better but does not correspond to this prototype, it might be disregarded out of hand.

Much of what we understand about these processes is based on the research of Daniel Kahneman and Amos Tversky, who demonstrated that, in reality, humans rely much more on intuition than on logical thinking when making hasty decisions. In the end, decision-making is not just a logical comparison of options. It is shaped by reasoning patterns, shortcuts, and biases that help us navigate complex environments efficiently, even when they move us away from fully objective judgment.