The negative income tax is a way to provide people below a certain income level with money

This is just the very first thing I found, and it indicates that we’re both almost right:
https://pubs.aeaweb.org/doi/pdfplus/…33003769204380

Although Friedman did not give a numerical example in his 1962 essay, he later suggested that a family of four be given a guarantee of $3,600 per year (1978 dollars) and a negative income tax rate of 50 percent . Thus, the vertical distance AC in Figure 1 would be $3,600, and each dollar of earnings would reduce the benefit by 50 cents. When income reached $7,200, the benefit would reach zero , corresponding to point D […]

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