Rules are easy to write. Incentives are harder to see. Yet in most systems—companies, governments, schools, markets—the visible structure is rules, while the real structure is incentives. One sits on paper. The other quietly shapes behaviour. So when outcomes look irrational, dishonest, or inefficient, people usually blame individuals: poor discipline, weak ethics, bad leadership. But often, the individuals are simply responding to the environment they were placed in. The system behaves exactly as its incentives allow. The Illusion: Rules Control Behaviour Many institutions operate under a comfortable belief: If we write clear rules, people will follow them. Organisations publish manuals. Governments pass regulations. Schools issue codes of conduct. Performance guidelines fill pages. But behaviour rarely aligns with written instruction. Consider three familiar situations. Corporate reporting. A company tells employees to prioritise long-term stability.…