2.2 - Consumer Behavior
Why and How Consumers Make Buying Decisions
At the core of it, consumers buy goods and services to meet their basic needs and wants. When there are rival products out there that could meet the same need, a few things shape which one someone actually picks: price, how differentiated the product is (its design, quality, brand, or extra features), whether it's actually available, and how it's been advertised.
For example, someone who needs running shoes has plenty of rival options. They might compare prices ($60 versus $140), features (extra cushioning, a lighter design, a brand they trust), availability (which pair is in stock in their size today, or which can ship by Friday), and advertising (the brand they keep seeing in ads worn by their favorite athlete).
Rational, Habitual, and Routine Decisions
Not all purchases get the same amount of thought. Rational buying decisions tend to show up for bigger, more consequential purchases, like a home, a car, or expensive electronics. These involve systematically comparing alternatives, weighing features, prices, quality, reviews, and long-term costs, to find the option that best fits someone's needs and wants. The tradeoff is that this takes real time and effort to gather and analyze all that information.
A rational decision usually follows a few steps: recognize the need, gather information about the options, compare them on what matters most (price, features, quality, reviews, long-term costs), make the choice, and then judge afterward whether it was a good one. For example, someone buying a used car might set a budget, research models online, read reliability reviews, compare insurance and gas costs, test drive a few, and then buy. That effort is worth it for a $15,000 purchase, but it wouldn't make sense to spend a whole afternoon comparing $2 snacks, since the time spent gathering information would be worth more than any money saved.
Habitual or routine decisions, on the other hand, are common for smaller everyday purchases, like grabbing coffee on the way to work or picking up snacks. These are usually driven by habit, convenience, or familiarity with a brand or store, and they involve a lot less conscious thought.
Factors Shaping Buying Decisions
Several categories of factors shape how people buy.
Personal factors are things like age, sex, education, income, budget, occupation, and lifestyle. These shape what a consumer actually needs, wants, and can afford, which in turn determines what products even feel like realistic or desirable options.
Psychological factors are more internal, things like a person's values and beliefs, how they perceive information and experiences, what they've learned from past experiences with products or brands, and their personal motivations. These shape someone's attitude toward a product and how willing they are to buy it.
Social and cultural factors come from outside the individual, like peers, family, social status, cultural norms, and media. These shape what feels normal, acceptable, or desirable to buy in the first place.
Situational influences are more temporary, tied to the specific moment of purchase. Things like a store's design (its noise, lighting, layout), the timing of the purchase (time of day, season, urgency), and whether the product is actually available or prominently displayed can all encourage or discourage a purchase in the moment.
Here's how all four can show up in one purchase. A 16-year-old with a part-time job and a $100 budget is shopping for wireless earbuds (personal factors: age, income, budget). She avoids off-brands because a cheap pair broke on her last year, and she believes a well-known brand will last longer (psychological factors: learning and perception). Most of her friends have the same popular brand, and it's what she sees in videos online (social factors: peers and media). At the store, that brand is on a big display near the entrance and there's a weekend sale (situational factors: store design, timing, and availability). All of these push her toward the same choice.
Legal and Technological Impacts on Purchasing Patterns
A purchasing pattern is basically someone's typical routine for buying things: when they buy, how often, and how much. This is shaped by where someone lives and works, their income, and the buying habits of their family and friends.
For example, a family of five living near a warehouse club might buy groceries in bulk twice a month, while a college student in a city apartment might pick up small amounts of food several times a week at a corner store. Where they live, their income, and what the people around them do shape both patterns.
Legal factors can shift what people can buy and when or where they can buy it. Consumer protection laws exist to help people avoid fraudulent or unsafe products, but legal changes can also make certain products harder to get, pushing consumers toward substitutes that meet the same need in a different way.
For example, U.S. federal law has set the minimum age to buy tobacco and e-cigarettes at 21 since December 2019, and some states and counties limit when or where alcohol can be sold. Consumer protection agencies, like the U.S. Consumer Product Safety Commission, work with businesses to recall unsafe products, like a toy with a choking hazard. When laws make a product harder to get, people find substitutes. When California banned single-use plastic bags at grocery stores, for example, shoppers started bringing reusable bags or buying paper ones.
Technological factors matter too, since new technology creates entirely new products and shopping methods. The internet, back in the 1990s, changed how people shop online, look up product information, and access digital services. Smartphones, arriving in the 2010s, made it easier to shop from anywhere, use apps, and stream entertainment. Shifts like these change how and when people meet their needs and wants, which reshapes purchasing patterns over time.
These changes show up in everyday patterns. Online stores are open all day, every day, so people can buy at midnight instead of waiting for a store to open. Shoppers compare prices on their phones while standing in a store. Streaming replaced trips to rent movies, and subscriptions turned one-time purchases into automatic monthly payments. Fast shipping lets people buy smaller amounts more often instead of stocking up.
Cialdini's Principles of Influence and Sales Tactics
Psychologist Robert Cialdini identified several psychological principles that make people more likely to comply with a request, and marketers lean on these principles all the time to encourage purchases.
Scarcity plays on the idea that the rarer something seems, the more people want it. Tactics like "limited-time offer" or "only a few left" create urgency to buy before the chance disappears.
Authority works because people tend to follow authority figures. This shows up as using expert spokespeople, like doctors or professionals, to endorse a product, or highlighting a service provider's credentials and expertise.
Consensus, or social proof, taps into the tendency people have to follow group norms and copy what others are doing. Positive customer reviews, ratings, and phrases like "best seller" all lean on this.
Liking works because people are more easily influenced by those they like or relate to. That's why ads often feature people who look, act, or live like the target customer, and why sales interactions try to build friendly, personal rapport.
Reciprocity is the idea that people feel obligated to give something back after receiving something of value. Free trials, samples, or small gifts can create a subtle pressure to buy in return.
Consistency plays on people's preference to act in ways that match their self-image and past choices. Marketers might frame a product as something "health-conscious consumers buy," or get someone to make a small initial commitment that leads naturally to a bigger one later.
Unity relies on the fact that people are more influenced by groups they feel part of. Businesses build this by creating a sense of community, like inviting customers into exclusive groups or clubs, or asking them to help shape products, emphasizing shared identity to build loyalty.
Evaluating and Developing a Sales Tactic
Not every tactic works for every product. To evaluate a sales tactic, ask a few questions. Does the principle fit the target customer and the product? (Authority works well for medicine or financial advice, while liking and unity work well for brands built around a lifestyle.) Is it honest? A fake "only 2 left" message or made-up reviews can break consumer protection laws and destroy trust once customers catch on. And is it worth the cost? Free samples work, but every sample is a product the business gives away.
To develop a sales tactic, start with the target customer, pick one or two principles that would actually move that customer, and turn them into a specific action or message. For example, a new protein bar company targeting high school athletes might hand out free samples after games (reciprocity), print a real endorsement from a certified sports nutritionist on the box (authority), and show on its website how many local teams already order from it (consensus).