Reproductive experience induces changes in females. Parity-related differences in maternal treatment of offspring can induce enduring changes in offspring. The relationships between maternal experience, early social isolation, and development were explored in rodents in this experiment. Male rats were weaned from multiparous (MP) and primiparous (PP) mothers and placed into isolation or social housing for four weeks. They were then observed in a social-interaction test.

Recently, aid effectiveness has become a popular topic in the literature. Generally, it is measured by instrumental measures of well-being, specifically, GDP per capita. This paper uses a substantive approach, pioneered by Amartya Sen, to evaluate aid effectiveness. Substantive measures attempt to measure welfare directly. Specifically, I use infrastructure as measured by telephone lines per 100 people, life expectancy, economic diversification as measured by agriculture as a percentage of GDP, and education as measured by enrollment in primary school, as substantive measures of well-being.