What explains the size of parliamentary staff?

Little is known about the staff who support MPs in their work. The literature suggests that these staff serve different important roles in democratic systems. This article compares the size of parliamentary staff in 48 countries and in 66 houses over an eight-year period. It compares three explanations of staff size, which reflect different roles they can have: firstly, that these staff serve MPs as compromise facilitators, planners and scribes. In that case, their number reflects the number of MPs. Secondly, that staff members function as information brokers and advertisers and as such act as intermediaries between the population and MPs. In that case, staff size reflects population size. And thirdly, that these staff primarily serve as a source of independent advice for MPs. In that case, staff size reflects the strength of the house they serve. Population size is found to be the dominant driver of the size of parliamentary staff.