住宅，不只是一個房子，還是一個家的所在。所以購屋，當然是一生中重大的決定。而與住宅相關的價格、環境、交通、品質、交易安全等這些都需要有專門的知識與經驗。另外住宅還涉及了很多風水、信仰、喜好等沒有對、錯的個人價值觀等問題。而且一生中發生的次數不多，不容易累積足夠的知識與經驗，所以要從購屋市場供給的產品中，找到完全符合自身需求住宅，不但一般人不容易做到，即使不動產的專業相關人員，由於購屋過程涉及多樣專業，亦不能面面俱到，作出最佳的購屋決策。本研究藉由文獻回顧與實證分析，就這個即重大又複雜的購屋問題，探討三個主題，其研究結果之結論如下： 一、我國各購屋方案可量化購屋影響因素，所存在的價格差異性 在實證結果部分，不論從地區上的分類，或是從時間上的分類，經自我選擇偏誤問題校正後。其拍賣市場相對於搜尋市場的住宅價格折價百分率確有差異，折價差異大約在1.53% ~3.69%間。實證結果顯示，購屋時機的不同階段呈現價差差異性，在2005~2007年第一季期期間景氣狀況較佳時價差不明顯之外，由不同地區與第一階段購屋時機(2003~2004) 景氣狀況較差時結果都顯示拍賣市場相對於搜尋市場的住宅價格仍有17%~24%明顯的折價現象。然替選方案之購屋影響因素，除了價格因素之價差外，仍有可量化之住宅條件因素與可量化之購屋者條件因素顯示其重要性。 二、不動產從業人員和一般人購屋決策的差異性 在這個主題裡，我們利用AHP(分析層級分析法)探討了與不動產密切的不動產從業人員和一般的購屋者，由不同地區來看，其最大的不同，是在台北縣及桃園縣的「不動產從業人員」購屋者，都最重視「住宅條件」，但在台北市的「不動產從業人員」的選擇上，卻優先考慮的是「價格」。 三、消費者購屋選擇決策的影響因素之評估指標及方案分析 我們利用AHP(分析層級分析法)，在台北市、台北縣、桃園縣三個地區，分別進行問卷調查、評估指標分析。發現在最優先考慮購屋方案的問題上，在五個購屋替代方案預售屋、成屋、金拍屋、銀拍屋、法拍屋，消費者最可能的購屋方案都是選擇成屋，權重都是五個替選方案中最高者。從此一結果結果得知，就購屋者認知的效用而言，成屋優於預售屋，且優於各拍賣市場的金拍、銀拍、法拍。 影響消費者選擇購屋決定的四個評估指標為價格、住宅條件、交易制度及購屋者條件四個因素，其中購屋者最重視的是「價格」及「住宅條件」，特別是價格，在台北市不論是「不動產從業人員」及「一般購屋者」、台北縣的「一般購屋者」及桃園縣「一般購屋者」，其權重都是四個評估指標中最高者。「價格」仍是大部分購屋決策中最重要的影響因素。但是不是有坊間所提的：「沒有賣不出去的房子，只有賣不出去的價格」，那般極端強調「價格」就是一切呢？仍值得商榷。 另外，在評估指標之影響因素細準則方面，從「價格」準則中其第三層細準則三個因素價差、交易費用、貸款中都為前三項之首選，可見得在購屋市場中建立「價格」資訊、秩序是很迫切的。在影響房屋住宅條件的因素中內環境、外環境為前三項之首選，而內環境為不論地區或各種購屋著都為重要考慮因素。「不動產從業人員」及「一般購屋者」的受訪者，除了價差為共同考量因素外，其差異性為前者亦考慮貸款，而後者加入交易費用之考量。以地區性來看只有桃園縣之不動產從業人員較重視環境，其他地區仍以價差為首選之考量因素。 / A residence is not just a house but also a place where people set up their homes. Purchasing a house is certainly a very important decision throughout everyone’s lifetime. However, the elements such as pricing, environment, traffic, quality, and transaction security that are closely in connection with such an important choice all take specialized knowledge as well as experiences. Besides, to appraise a residence also involves some personal view of values such as fate, beliefs, and fondness, which are rather difficult to be thought of as good or bad. Moreover, purchasing a house is something that isn’t going to happen frequently throughout one’s life, so there won’t be many chances to accumulate enough knowledge and experiences in this field. Not only is it difficult for common public to choose, among the supply of housing market, a residence that would completely meet their own demand but it is quite a challenge for a professional real estate agent to make a decision on how to purchasing a most suitable residence as the process is often so diversified and specialized. In this study, by means of reviewing related documents and analysis, three main subjects based on this critical and complicated issue of house purchasing have been explored, and the conclusions of the research are given as follows: 1. The price differences among quantifiable and determination factors of each house purchasing alternatives. In practices, it is verified that whether it is classified based on regional divisions or based on timing of purchasing, differences do exist in housing price discount percentage between auctioning market and searching market after correcting the estimate bias of self-selection, and differences of price discount fall roughly between 1.53% and 3.69. It is also verified that, by observing various districts in the first house purchasing stage (2003~2004), a period falling in economical recession, price differences do vary with different purchasing timings in the stage. The price differences of the auctioning market relative to searching market appear significant price discount percentage ranging from 17% to 24%. The only exception to this case might be during each of the first seasons in the years from 2005 to 2007, a period of booming economy, in which price differences didn’t seem so significant. However, when it comes to decisive factors of alternative house purchasing choices, there are still some quantifiable elements of resident condition and quantifiable purchaser elements that can be evaluated in addition to price differences. 2. The difference in making decision on house purchasing between real estate professionals and ordinary buyers. In this theme, we utilize AHP to explore the interaction between real estate professionals who are closely related to this industry and ordinary buyers. From the regional point of view, the most significant variance appears in Taoyuan County and Taipei County where real estate professionals and ordinary buyers both value “resident conditions” as a most important factor while in Taipei City real estate professionals would view the price as the first priority. 3. Evaluation indicators and alternatives analysis of the factors which affect consumer in making decision on house purchasing. Adopting AHP as an analytical method, we carried out questionnaire survey in Taipei City, Taipei County, and Taoyuan County as well as analyze their appraisal indicators. The findings are that, among five purchasing programs, namely newly completed houses, houses ordered before being built, houses auctioned by court, houses auctioned by banks, and houses auctioned by private financial sectors, the most likely case that consumers will choose is that of newly completed houses. The four evaluation indicators that have affected consumers’ decision on buying a house are price, residential conditions, transaction system, and purchasers’ conditions. Among them, price and residential conditions are given more weight by consumers, but price alone possesses the highest weight to which both real estate professionals and ordinary buyers in Taipei City, ordinary buyers in Taipei County, and ordinary buyers in Taoyuan County all have given. Price is still the most influential factor when making a decision on house purchasing. However, is it realistic that price is so decisive as to reach to the extent like many people say “There is not any unmarketable house but an unacceptable level of price” ? The extremely aspect of this view needs be further considering deliberately. As for the influential factors set up under the four evaluation indicators, here are the analyses: The three factors (price difference, transaction fee, and loan) of the first indicator named “housing price” are the first three valued factors either observed based on regional variance or based on purchasers. It can therefore be realized that how important and urgent it is to establish “price” information of the house purchasing market. In the second appraisal indicator named residential conditions, internal/external environment are the first three valued factors. However, internal environment seems to have more priority, and that is quite consistent with the traits of our fellow people, most of whom think only to care about themselves. Such phenomenon is quite common in many residential communities nowadays. The real estate professionals and ordinary buyers both value “price difference” as a most important factor while the former added the factor of transaction fee, and the latter added up loan. From the difference areas point view, only Taoyuan County value “environment” more important than others. The rest of areas value “housing price” is the most important factor than others.