本文採用1988--2004年行政院主計處「臺灣地區家庭收支調查」，
分析家戶內共居行為在不同分量上之特徵，
檢視這些共居家庭在全體社會所得分配中的所在位置，
是否因地理區域或家庭內各成員所得分布而有不同?
實證結果發現共居行為不易發生在輩分較小且所得能力高之「家庭組成單元」，
隱含年輕的「家庭組成單元」較不願與長輩共居之現象。
家戶平均可支配所得在中部、南部以及東部地區顯著低於北部地區之家戶；
房屋自有與房地租變數對平均可支配所得存在顯著正向關係。
此外本文也針對四口之家估計貧窮門檻，
證實共居行為對多數「家庭組成單元」是有利的；
本文得到之結論也證實，
以家庭為單位分析所得分配會因為忽略共居帶來的效果，
而低估所得不均度。

Using the 1988 to 2004 Family Income and Expenditure Survey (FIES),
this thesis examines effects of geographic factors and within-family income concentration
on various quantiles of the income distribution among all co-residing families.
Our empirical findings show that it is more unlikely for young family members with higher incomes
to co-reside with elderly members,
and co-residence tends to relieve poor family members in poverty.
We also verify the benefits from co-residence due to its increasing-returns-to-scale property
by comparing income distributions among co-residing and non co-resing families.

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