Search results for "Relative cost"
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Median vs. Mean in Poverty Alleviation
2011
When evaluating poverty, the relative poverty line may be taken as a percentage of either normalized median or normalized mean income. It is proved that, for any family of non-intersecting Lorenz curves, when the poverty line is set relative to the normalized median income, reducing poverty become less costly in proportion to the total income when inequality is great and increasing; a counter-example proves that such a change may be associated with greater poverty. However, when the poverty line is set relative to the normalized mean income, the relative cost of poverty alleviation always increases with inequality and poverty, as expected. One concludes that the poverty line should be taken…
Data from: Daphnia invest in sexual reproduction when its relative costs are reduced
2018
The timing of sex in facultatively sexual organisms is critical to fitness, due to the differing demographic consequences of sexual vs. asexual reproduction. In addition to the costs of sex itself, an association of sex with the production of dormant life stages also influences the optimal use of sex, especially in environments where resting eggs are essential to survive unfavourable conditions. Here we document population dynamics and the occurrence of sexual reproduction in natural populations of Daphnia magna across their growing season. The frequency of sexually reproducing females and males increased with population density and with decreasing asexual clutch sizes. The frequency of sex…