What is the interplay between informal networks, such as those that facilitate risk-sharing among households, and institutions such as public transfers and formal financial intermediation? Much of the existing literature on informal networks in economics focuses on either altruism or strategic mechanisms for their formation and maintenance. This approach stands in sharp contrast to perspectives...

This paper evaluates changes in electricity generation costs caused by the introduction of market mechanisms to determine production United States. I use staggered transition markets from 1999 2012 estimate causal impact liberalization using a differences-in-difference design on comprehensive hourly panel demand, generators’ costs, capacities, and output. find that reduce 5 percent reallocating...

statement of problem: following the increasing use of composites in restoring anterior and posterior teeth, problems due to its technique sensitivity have become a major concern. one of these problems is the possibility of contamination of dentin with saliva, blood and/or gingival fluid in different stages of bonding procedure, even with application of different methods of isolation. however, b...

The principles for measuring the extinction ratio and transmittance of a polarizer are formulated by use of the principal Mueller matrix, which includes both polarization and depolarization. The extinction ratio is about half of the depolarization, and the contrast is the inverse of the extinction ratio. Errors in the extinction ratio caused by partially polarized incident light and the misalig...