savings greater than income
working on the BHPS I noticed that there is a lot of observation which show annual saving (amount saved each month * 12) is greater than total annual income (fiyr). Most of these people are originally from the U.K. ( so remittance can be excluded) and not all of them are married. Such problem is present even if I reduce the sample to people older than 40.
Do you have an explanation for this evidence? I assumed that "fiyr" contained all the possible sources of income.