An omnibus survey is a co-financed survey, also known as a multi-client or multi-sample survey, which involves conducting a quantitative study with a representative sample, generally composed of more than 1,000 people nationwide. Several companies collaborate to develop a common questionnaire, each adding its own questions, thus pooling the high costs associated with this type of study. This method therefore offers small and medium-sized enterprises access to large samples while maintaining their representativeness.