From a recent paper:

Populists are often defined as those who claim that they fill “political representation gaps” -differences between the policymaking by established parties and the “popular will.” Research has largely neglected to what extent this claim is correct. I study descriptively whether representation gaps exist and their relationship with populism. To this end, I analyze the responses of citizens and parliamentarians from 27 European countries to identical survey policy questions, which I compile and verify to be indicative of voting in referendums. I find that policymaking represents the economic attitudes of citizens well. However, I document that the average parliamentarian is about 1SD more culturally liberal than the national mean voter. This cultural representation gap is systematic in four ways: i) it arises on nearly all cultural issues, ii) in nearly all countries, iii) nearly all established parties are more culturally liberal than the national mean voter, and iv) all