Research shows that grocery stores reduce prices to compete with Walmart Supercenters. This study finds evidence that the competitive effects of two other big box retailers – Costco and Walmart-owned Sam's Club – are quite different. Using city-level panel grocery price data matched with a unique data set on Walmart and warehouse club locations, we find that Costco entry is associated with high...

in the family, women can benefit from the newest information and knowledge on various life subjects and use them to train other members of the family; they can also use the knowledge to replce new and optimal beliefs with the false ones thereby oncreasing the soci-cultural level of the family more than before. in this study, family economic efficiency including women's participation in hou...

nowadays family tkaful in islamic societies has been  studied as islamic financing tools and in detail as a legal institution based on the theory of common benefit – common loss and collective cooperation. likewise in some western countries, among the uk , family tkaful as risk financing tools has important role beside insurance in society risk  financing.  it's seems to be necessary, shia...

Glutathione S-transferases (GSTs: E.C. 2.5.1.18) are a multigene family of multifunctional dimeric proteins that play a central role in detoxication. Four allelic forms of the mosquito Anopheles dirus GST, adGST1-1, were cloned, expressed and characterized. The one or two amino acid changes in each allelic form was shown to confer different kinetic properties. Based on an available crystal stru...