公正取引
There have been very few attempts at Fair trade impact studies. It would be methodologically and logically incorrect to use these attempts to conclude that fair trade in general does or does not have a positive impact. Griffiths (2011) argues that few of these attempts meet the normal standards for an impact study, such as comparing the before and after situation, having meaningful control groups, allowing for the fact that fair trade recruits farmers who are already better off, allowing for the fact that a fair trade cooperative receives aid from a dozen other organizations – Government Departments, Aid Agencies, donor countries, and NGOs, and allowing for the fact that fair trade may harm other farmers. Serious methodological problems arise in sampling, in comparing prices, and from the fact that the social projects of fair trade do not usually aim to produce economic benefits.