People who remain overemployed tolerate longer hours because they either expect their overemployment to be brief (such as temporary care-giving), or figure that part-time or reduced hours status involves too large a sacrifice in terms of benefit coverage or job status.
Source: wiktionary
In sum, survey estimates of overemployment may be biased downward if a survey provokes certain implicit assumptions about the current income foregone, and the amount and dimensions of hours reduced and type of gains realized in time off.
Source: wiktionary
Labor-leisure models portray overemployment as an individual labor-market phenomenon, but it can also be viewed from a macroeconomic perspective.
Source: wiktionary