Many times there is enough symbolic compensation in the form of candy or maybe a biobil if the survey requires greater commitment and time by the respondent. However, it is important that the remuneration is not perceived as a bribe, ie the compensation must be reasonable, given the expected repayment.
In many cases psychological incentives work at least as well as economic. Being a respondent to make a difference through his participation can often be more than enough as motivation. In the Learning Barometer, which Enkätfabriken works in collaboration with Lektion.se, each respondent contributes through its participation in donating money to the Swedish Afghanist Committee, which works for more children to attend school. Read more about SAK’s work here: https://sak.se/vart-arbete/utbildning