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防尘投资的直接经济效益是节省的硅肺病人的抚养费,其间接经济效益是避免了由于硅肺病人丧失劳动能力所引起的税利损失,这两项之和扣除防尘投资即为净总效益。提出了具体的计算方法,并举江西某钨矿为例。该矿自1958年到1983年矿井防尘投资680万元,1958年以后始接尘的1300人中至1983年底未发现一例硅肺。而1957年以前始接尘的1400人中,至1983年底共检出硅肺767人,已支出抚养费650万元。计算表明,该矿的防尘投资总效益为1008万元,也很显著。
The direct economic benefits of dust-proof investment is the saving of silicosis patients, the indirect economic benefit is to avoid the loss of tax profits caused by the incapacity of silicosis patients, the sum of these two deductions is the total net investment benefit. Proposed a specific method of calculation, and a tungsten mine in Jiangxi as an example. The mine from 1958 to 1983 mine dust investment 6.8 million yuan, dust began in 1958 1300 people in the end of 1983 did not find a case of silicosis. Of the 1,400 people who started dusting before 1957, 767 people were silicosis by the end of 1983, and 6.5 million yuan have been spent on maintenance. Calculations show that the mine’s total investment in dust prevention efficiency of 1008 yuan, is also very significant.