Pay someone more and, intuitively, they should work harder. In 1959, the psychologist Frederick Herzberg interviewed engineers and accountants about specific moments they'd felt exceptionally good or exceptionally bad about their jobs, expecting the answers to sit at opposite ends of a single scale — the things that make work satisfying being the mirror image of the things that make it miserable. They weren't. He got two almost entirely separate lists, and salary landed on the one that, by itself, can't make anyone satisfied at all.
Two different questions produce two different lists
The good-moment stories clustered around achievement, recognition for a job well done, the interest of the work itself, responsibility, and advancement — Herzberg called these motivators. The bad-moment stories clustered around a different set almost entirely: company policy, the quality of supervision, salary, interpersonal relationships, and working conditions — hygiene factors. If satisfaction and dissatisfaction were opposite ends of one line, the same handful of factors should have shown up driving both. Instead, motivators barely appeared in the bad stories, and hygiene factors barely appeared in the good ones.
Hygiene keeps you from hating the job. It doesn't make you love it.
Herzberg's conclusion followed from that split: satisfaction and dissatisfaction aren't opposite ends of a single scale, they're two separate scales entirely. The opposite of job satisfaction, in his model, isn't dissatisfaction — it's simply no satisfaction. The opposite of dissatisfaction is no dissatisfaction. Hygiene factors like salary can move someone from dissatisfied toward neutral by removing a source of complaint, but pushing past neutral into genuine motivation, on this model, takes something else — achievement, recognition, meaningful responsibility — that money on its own doesn't reliably supply.
What we're still unsure about
The method that produced this split has drawn real, ongoing criticism. Asking people to explain, after the fact, why they felt good or bad tends to trigger a well-documented self-serving pattern: people credit their own achievement and skill for good outcomes and blame external circumstances — a bad policy, a bad manager — for bad ones. That alone could manufacture something that looks exactly like a two-factor split, without there being two genuinely separate psychological systems underneath it at all. Later studies using different methods than Herzberg's original interview technique have produced mixed, sometimes contradictory results, so how much of the two-factor theory reflects a real structure of workplace motivation, versus an artifact of how people narrate their own good and bad days, is still an open question in organisational psychology.
This sits inside Motivation & Organisational Behaviour (Maslow, Herzberg), one of seven topics in Management, one of four domains in Business, one of seventeen subjects the app can quiz you on.