Grant actually owned one slave himself as well: Grant himself owned a slave named William Jones, acquired from his father-in-law. At a time when he could have desperately used the money from the sale of Jones, Grant signed a document that gave him his freedom. Grant freed this slave in 1859.
Volunteers dedicated more than 100 hours, on average, to sports and recreation (120 hours), religion (117 hours) and social services (116 hours). But they gave only about half as many hours to education and research associations (66 hours) and to health-related organizations (58 hours) (Chart 3).
And volunteering should not be measured that way. Ever. We can add up the hours but not a dollar value. Others would like to do so. The federal government, for example, would like to add up the billions of hours of volunteer time in Canada, multiply by an hourly rate and determine the economic value of volunteering. This is simplistic and dangerous.