Collective agreement coverage or union representation refers to the proportion of people in a country population whose terms and conditions at work are made by collective bargaining, between an employer and a trade union, rather than by individual contracts. This is invariably higher than the union membership rate, because collective agreements almost always protect non-members in a unionised workplace. This means that, rather than individuals who have weaker bargaining power representing themselves in negotiations, people organise to represent each other together when negotiating for better pay and conditions in their workplace. The number of people who are covered by collective agreements is higher than the number of union members (or the "union density" rate), and in many cases substantially higher, because when trade unions make collective agreements they aim to cover everyone at work, even those who have not necessarily joined for membership.
Certainly, the causes of higher or lower collective bargaining coverage can vary and are subject to debate. Some common factors that are often identified as influencing the extent of collective bargaining coverage include:
These factors interact in complex ways and can vary significantly across countries and regions, contributing to ongoing debates about the causes and consequences of collective bargaining coverage levels.