The return-risk stucture of lowland agriculture in Northern Ireland
运用夏普单指数模型计算北爱尔兰低地农业各企业的贝塔系数，按收益波动性分类，并构建最优农业投资组合，为风险规避型农户提供多样化建议。
The intention of this paper is to employ the single index model, founded in the work of Sharpe (1963) to develop risk measures for lowland agriculture in Northern Ireland. A central feature of the single index model is the beta coefficient which measures each enterprise's systematic risk and allows enterprises, in terms of their returns variability, to be claCssified as defensive, neutral or aggressive. These beta coefficients are themselves then employed as input information in the derivation of optimal agricultural portfolios with the construction of these portfolios suggesting that the risk adverse farmer who wishes to minimise risk subject to a given return level should diversify across a range of enterprises.