Category
Categories (or typology) are a related set of concepts that help you notice and explain important differences.
In China’s Gilded Age (book) and Unbundling Corruption (article), Yuen Yuen Ang introduce a four-part typology of corruption: petty theft, grand theft, speed money, access money. This typology helps us distinguish among the four types of corruption and their effects.
The concept of access money, in particular, brings attention to the issue of institutionalized elite exchanges, often overlooked in global corruption metrics.