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Mincome was an experimental Canadian guaranteed annual income project that was held in Manitoba, during the 1970s. The project, funded jointly by the Manitoba provincial government and the Canadian federal government under Prime Minister Pierre Trudeau. It was launched with a news release on February 22, 1974, under the NDP government of Edward Schreyer, and was closed down in 1979 under the Conservative government of Sterling Lyon and the federal Progressive Conservative Party of Joe Clark. The purpose of this experiment was to assess the social impact of a guaranteed, unconditional annual income, including whether a program of this nature would cause disincentives to work for the recipients and how great such a disincentive would be.

The experiment comprise a randomized controlled trial in the city of Winnipeg and rural Manitoba (the rural dispersed site). A so called "saturation site" pilot project in the town of Dauphin was added in 1973. The Winnipeg and rural Manitoba sites randomly allocated lower-income household to one of seven treatment groups and a control group. The families in the treatment groups received an income guarantee or minimum cash benefit according to family size that was reduced by a specific amount (35, 50 or 75 cents) for every dollar they earned by working. Dauphin residents were eligible for a single treatment that reduced the benefit guarantee by 50 cents for each dollar earned. Also the Dauphin site had only one plan (Plan 4) and unlike the Winnipeg and rural dispersed sites, any resident of the city could apply.

No final Mincome report was issued, but a federal grant established the Institute for Social and Economic Research at the University of Manitoba in 1981. The Institute developed a machine-readable database of the results of Mincome, leaving the analysis of the experiment to individual academic initiatives.

An important motivation of Mincome and the negative income tax experiments in the U.S. was to determine the impact of a guaranteed income plan on incentives to work. University of Manitoba economists Derek Hum and Wayne Simpson analyzed labour supply or work disincentive issues in Mincome during the 1980s and published their results in a series of papers and a monograph. Their results showed a small impact on labor markets, with working hours dropping one percent for men, three percent for married women, and five percent for unmarried women. Indeed, the largest impact appeared to be changes in family composition not the experimental treatments, as preschool children increased the labour supply of husbands and reduced the labour supply of wives by roughly the same modest amount. Even these decreases in hours worked may be seen to be offset by the opportunity cost of more time for family and education. However, some have argued these drops may be artificially low because participants knew the guaranteed income was temporary. This represents an important limitation to the knowledge of the impact of a guaranteed annual income; little is known about the long term effects on willingness to work.

Economists Derek Hum and Wayne Simpson analysed the labour supply responses and discovered that they were generally smaller than those estimated for similar experiments in the United States. David Prescott, Robert Swidinsky and David Wilton examined the labour supply response of female heads of household, showing that the presence of younger children and another income earning head (husband) prompted a reduction in work. Most recently, David Calnitsky published an analysis of a community survey of Dauphin completed in 1976 that probed for motivations for participation and perceptions of stigma associated with a GAI. He finds that an important benefit of basic annual incomes is the reduced stigma compared to conventional welfare.

University of Manitoba economist Evelyn Forget conducted an quasi-experimental analysis that compared health outcomes of Dauphin residents with other Manitoba residents i. This research did not use the Mincome data directly, but under the assumption that if a high proportion of Dauphin residents participated in Mincome, one should be able to discern differences in social, economic and health outcomes for that group, compared to the general population. She found that only new mothers and teenagers worked substantially less. Mothers with newborns stopped working because they wanted to stay at home longer with their babies, and teenagers worked less because they weren't under as much pressure to support their families, which resulted in more teenagers graduating. In addition, those who continued to work were given more opportunities to choose what type of work they did. Forget found that in the period that Mincome was administered, hospital visits dropped 8.5 percent, with fewer incidents of work-related injuries, and fewer emergency room visits from accidents and injuries. Additionally, the period saw a reduction in rates of psychiatric hospitalization, and in the number of mental illness-related consultations with health professionals.