A utilitarian social planner who maximizes social welfare assigns the available income to those who are most efficient in converting income into utility. However, when individuals are concerned about their income falling behind the incomes of others, the optimal income distribution under utilitarianism is equality of incomes. JEL classification: H0, I0, I30, I31

We characterize a family of r-extended generalized Lorenz dominance quasi-orderings and a family of r-Gini welfare orderings, on the basis of two allegedly “incompatible” axioms for heterogeneous welfare comparisons (Ebert, 1997, Ebert and Moyes, 2003, Shorrocks, 1995), but at the cost of either completeness or separability. JEL classification: D31, D63, I31.

This paper investigates immigrant assortative mating and relationship satisfaction. Using a modifi ed random eff ects ordered probit model, the paper demonstrates that spouses of mixed couples are signifi cantly less satisfi ed with their partner than nativeonly and foreign-only couples. JEL Classifi cation: F22, I31

We prove that the maximal singular fibres of elliptic K3 surfaces have type I19 and I∗ 14 unless the characteristic of the ground field is 2. In characteristic 2, the maximal singular fibres are I18 and I ∗ 13. The paper supplements work of Shioda in [9] and [10]. MSC (2000): 11G25, 14J27, 14J28.

Penyakit yang disebabkan oleh mikroba patogen telah menginfeksi makhluk hidup seperti manusia, hewan, dan tanaman. Hal ini memberikan dampak negatif bagi kesehatan manusia menurunkan kualitas produksi di bidang pertanian. Agen biokontrol dapat digunakan untuk mencegah infeksi aman ramah lingkungan. Penelitian bertujuan mengetahui potensi dari bakteri Streptomyces sp. strain i18 sebagai agen dal...