Quota share reinsurance (source code)

= Quota share reinsurance
{title2=$S_I=\alpha S$}

Quota share reinsurance retains a fixed proportion $\alpha\in[0,1]$ of each claim. The annual retained aggregate is $\alpha S$, whose <expected value> and <variance> are $\alpha\mathbb ES$ and $\alpha^2\operatorname{Var}(S)$.