Item non-response on income and wealth questions

This study investigates the mechanisms determining item nonresponse focusing on three issues: First, is there significant heterogeneity in item non-response across financial questions and in the association of covariates with item non-response across outcomes? Second, can the informational value of surveys be improved by matching interviewers and respondents based on their characteristics? Third, how does offering a don't know answer option affect respondent behavior? The questions are answered based on detailed survey and interviewer data from the German Socioeconomic Panel using a broad set of income and wealth outcomes. We find considerable heterogeneity in non-response across financial items, little explanatory power of interviewer-respondent matches and strong evidence that don't know answers result from mechanisms that differ from those yielding valid responses and outright refusals to respond.