Cost-Benefit Analysis & Partial Budget Analysis
摘要
In cost-benefit analyses (CBAs) and partial budget analysis, all parameters, i.e., costs and effects, are expressed in monetary units. These approaches are the common types of health economic analysis in the livestock sector. Social CBAs are used to guide decisions on large-scale programs with broad societal significance, such as national or global disease control initiatives. Private CBAs assess whether a livestock venture is economically viable by comparing the cost of a health or management intervention with the benefits, typically measured in terms of increased productivity. Partial budgeting, on the other hand, is the preferred method to evaluate the economic impact of relatively small management changes. It considers only those costs and benefits that are directly affected by the intervention. The outcomes of CBAs are commonly expressed as net present value (the present difference between benefits and costs), benefit-cost ratio (the ratio of net present benefits and net present costs) or internal rate of return (the discount rate that makes the net present value zero). Results from partial budgeting are mainly expressed as change of profit due to an intervention. Unlike partial budget analyses, CBAs often span several years, and therefore require discounting to account for the time value of money.