To facilitate individuals to adjust their skills to changes in market demands, Sweden has a relatively generous policy to stimulate formal adult education at the compulsory, upper secondary and tertiary levels. This paper provides an overview of what research has reported to assess if and/or how it may be an efficient use of tax payers' money. Some institutional factors are also briefly presented to discuss what is likely to be required for such a policy to exist in a particular country. (Contains 3 tables, 4 figures and 6 footnotes.)