Why Is Your Kindness Worth Less and Less? The Bebel Effect Reveals the Truth About Interpersonal Relationships

Have you ever encountered this situation: you do a lot for friends or colleagues, and at first they are grateful and appreciative, but gradually, your efforts become taken for granted. Even more hurtful, whenever you don’t lend a hand, they’re disappointed or even say you’ve changed. Many people struggle in this dilemma, unaware that behind it lies a deep psychological principle—the Law of Berb. This principle may seem obscure, but it’s actually the key to understanding how relationships can change qualitatively.

If you understand how the Law of Berb works, many interpersonal problems won’t be dead ends but opportunities to improve your relationship quality.

Understanding the Law of Berb: Why Do People Take Your Effort for Granted No Matter How Much You Give?

Let’s break down the essence of the Law of Berb. Simply put, it describes a process where a person’s response to stimuli diminishes over time—initially, the reaction is strongest; then, the brain begins to adapt, and each subsequent feeling weakens until, one day, what once moved you becomes just background noise.

You’ll notice that when a friend receives a gift from you for the first time, their eyes light up; the warmth can still be felt the second time. But by the tenth gift, they’re used to it and may not even thank you anymore. This isn’t indifference; it’s the brain’s self-protection mechanism at work—our cognitive resources are limited. If we remained highly sensitive to every act of kindness, life would be overwhelmed.

From a neuroscience perspective, this is even more interesting. Every time you do something pleasant, the other person’s brain releases dopamine—the chemical responsible for excitement and satisfaction. But the reward system is smart; it quickly predicts when the next good thing will happen. When it does, dopamine levels drop significantly. This explains why the honeymoon phase feels so sweet, but once the relationship stabilizes, familiar intimate acts no longer evoke the same emotional response.

Even more fascinating, this phenomenon has an economic counterpart called “diminishing marginal utility”—the first unit of investment yields the greatest return, but as you continue to invest more, each additional unit brings less and less benefit. This isn’t just about feelings; it’s a fundamental law of how the human brain operates.

The Brain’s “Adaptation Game”: From Scientific Validation to Life Insights

The classic experiment validating the Law of Berb is the “weights experiment.” Participants initially hold a 400-gram weight, then it’s increased by 5 grams to 405 grams; most can immediately feel the difference. But if the initial weight is 4000 grams and it’s increased by 5 grams, almost no one notices the change. The same 5-gram increase feels vastly different depending on the starting point—this vividly demonstrates the Law of Berb in physical sensation.

Psychologists who first discovered the Law of Berb used similar experiments: the larger the initial stimulus, the harder it is to perceive incremental changes. This principle applies not only to tactile sensations but also to relationships, consumer psychology, and habit formation.

In 2016, a study published in a British psychology journal found that participants receiving rewards at high frequency experienced quick loss of novelty. Conversely, when reward frequency decreased, people revalued the reward and remembered it more deeply. In other words, less is more. If you bring coffee to a colleague every day, they’ll get used to it; but if you do it once a week, they’ll anticipate and remember it, even noticing when you forget.

Three Reversal Strategies: Keep Your Kindness Bright and Everlasting

Knowing how the Law of Berb works, the question is—how can you ensure your efforts retain their value and your kindness remains felt? The answer is practical.

Step 1: Intentionally control the frequency of your efforts, making kindness scarce

Don’t pour everything out at once. Especially in new relationships, low-frequency but high-quality help and greetings are more likely to be appreciated than daily, on-demand assistance. When friends or colleagues ask for help, sometimes offer to help, sometimes honestly say, “It’s not convenient this time, but I’ll try next time.” This can awaken their expectations of you. Setting boundaries actually maintains the “psychological threshold” of your relationship.

Step 2: Create small variations to break predictability

The brain fears not absence but predictability. You don’t need to mechanically repeat the same kindness; instead, change things up regularly. Maybe help with actions this time, encourage with words next time; or vary how you show concern—sometimes a text, sometimes a call. This unpredictability keeps the brain alert to you. This strategy works well in team motivation, parent-child relationships, and romantic bonds.

Step 3: Gracefully say “no” to maintain your boundaries

This is the most underestimated strategy. Every act of kindness should be perceived as not easily given, to preserve its scarcity. Saying “no” may seem cold, but it’s actually protecting the health of the relationship. Psychologist Timothy Wilson said: a sense of boundary in relationships is the true long-term love. Someone who occasionally says “no” is more respected than someone who always says “yes.”

Moving from Passivity to Active Management: From Understanding the Law of Berb to Taking Control

Ultimately, the Law of Berb shouldn’t be used as a weapon or a tool for manipulation. True wisdom lies in self-awareness—adjusting your sensitivity to feedback, making deliberate efforts, and distributing your limited kindness to those who truly deserve it.

Don’t let your sense of value depend entirely on others’ approval. Once you understand the logic of the Law of Berb, you’ll realize that maintaining a sense of mystery and scarcity is the secret to keeping relationships vibrant. Every proactive act of help becomes more meaningful, and gratitude becomes more cherished because it’s less frequent.

Carefully manage your giving threshold, be sensitive when needed, and maintain distance when appropriate. How others respond to you no longer shakes your interpersonal initiative. That’s the mark of someone who truly understands the Law of Berb.