Research on Revenue Insurance Premium Ratemaking of Jujube Based on Copula-Stochastic Optimization Model

Table 4

Premium rate and risk of jujube revenue insurance in Aksu region.

Guarantee level	100 (%)	95 (%)	90 (%)	85 (%)	80 (%)	75 (%)	70 (%)
Pure premium rate	11.33	10.06	8.81	7.61	6.43	5.31	4.24
Gross premium rate	16.42	14.58	12.77	11.03	9.32	7.69	6.14
Risk reduction ratio insured	47.03	41.75	36.45	31.21	26.08	21.15	16.51

Note. gross rate = net rate × (1 + safety factor) × (1 + operating expense factor) × (1 + predetermined savings rate), safety factor is 15%, operating expense factor is 20%, and predetermined savings rate is 5% [22].