This paper analyzes the constituency resource allocations of members of the New Zealand Parliament, a legislature with both strong party discipline and small legislative districts. Close constituency contact is the norm in spite of (or perhaps because of) a lack of resources. Legislators return to their districts often or reside in their districts, handle casework personally, and make frequent local appearances. Cabinet ministers and older, more senior MPs are less likely to follow a pattern of close constituency contact; younger, less senior MPs are more likely to do so.

http://www.jstor.org/pss/439426