AÇIĞA ÇIKARILAN TERCİHLER: TEORİ VE UYGULAMA

Türkiye’deki hanehalkları için açığa çıkarılan tercih teorisinin geçerliliğinin test edilmesinin, tüketici tercihlerindeki rasyonelliğin belirlenmesinin ve rasyonalitenin ihlal edilmesi durumunda ortaya çıkan refah kayıplarının ölçülmesinin amaçlandığı bu çalışmada, açığa çıkarılan tercih aksiyomları parametrik olmayan yöntemler kullanılarak yatay-kesit verileri üzerinden test edilmiştir.Türkiye ölçeğinde tüketici davranışlarının analiz edildiği uygulamada, 2004-2017 dönemi Türkiye İstatistik Kurumu Hanehalkı Bütçe Anketi veri seti kullanılmıştır. Hanehalkı seçimleri üniter ve kolektif tüketim modeli varsayımı altında ele alınarak oluşturulan seçim yapılarına ilişkin açığa çıkarılan tercih aksiyom ihlal oranları ve rasyonellik endeksleri hesaplanmıştır. Elde edilen bulgular, hanehalklarının aksiyomlar ile yüksek oranda tutarlı davranışlar sergilediğini göstermektedir. Ayrıca hanelerin analiz dönemi boyunca gelirlerini etkin kullandığı, fiyatlardaki beklenmeyen değişimlerin tüketici rasyonelliği üzerinde önemli bozucu etkiler yarattığı ve bu durumun hanelerde ortalama olarak %25 seviyesinde refah kaybına neden olduğu tespit edilmiştir. Kolektif tüketim modeli varsayımı altında oluşturulan tercihlerin rasyonaliteyi daha az ihlal ettiği ve daha az refah kaybına neden olduğu görülmüştür. Son olarak, bireylere ait yaş, eğitim, cinsiyet ve gelir durumu gibi sosyoekonomik değişkenlerin tercih rasyonelliği üzerindeki etkili olduğu belirlenmiştir.

Anahtar Kelimeler:

Açığa Çıkarılan Tercih, Etkinlik Endeksleri, WARP, SARP, GARP

REVEALED PREFERENCES: THEORY AND APPLICATION

In this study which aims to test validity of the revealed preference theory for Turkish households, determine the rationality in consumer preferences and measure welfare loss in case of violation of rationality, the revealed preference axioms are analyzed by using non-parametric methods over cross-sectional data. In the application where consumer behaviors of Turkish households are analyzed, 2004-2017 period Turkey Statistical Institute Household Budget Survey data set is used. The revealed preference axiom violation rates and rationality indices are calculated by considering preferences of households under the assumption of a unitary and collective consumption model. Findings show that households exhibit highly consistent behaviors with axioms. In addition, it is obtained that households used their incomes effectively during the analysis period, unexpected changes in prices have significant negative effects on consumer rationality and this causes an average welfare loss of 25% in households. It is also seen that the preferences created under the assumption of collective consumption model are less violating rationality and caused less loss of wealth. Finally, it is determined that socioeconomic variables such as age, education, gender and income status of individuals have an impact on preference rationality.

Keywords:

Revealed Preference, Power Measures Index, WARP, SARP, GARP,

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