Cardinal scores of individual competitive ability allow us to quantify the magnitude of the difference between the competitive ability of any two individuals. However, they have rarely been used in animal behaviour because most researchers were mainly interested in ordinal ranking. In this paper, we validated the normalized David's score (David H. A., Biometrika 74, 1987, 432; de Vries H., Stev...

In markets where buyers and suppliers negotiate prices, supplier costs, buyer willingnessto-pay, and competition (forces strategists often refer to as sources of bargaining power) determine only a range of potential prices, leaving the final price dependent on other factors (e.g. negotiating skill), which I call bargaining ability. I use a model of buyer demand and buyer-supplier bargaining, co...

Meiotic drive results when sperm carrying a driving chromosome preferentially survive development. Meiotic drive should therefore influence sperm competition because drive males produce fewer sperm than non-drive males. Whether meiotic drive also influences the competitive ability of sperm after ejaculation is unknown. Here we report the results from reciprocal crosses that are designed for est...