Emotional appeal (Pathos)
In her speech, Sojourner is trying to depict her suffering by saying that she gave birth to 13 children and saw them all sold into slavery, in order to provoke empathy and get an emotional reaction from the public. According to Aristotle,This approach is know as Pathos, which consists in an appeal to the audience's emotions.
i don't know if this is right but i think the answer is Feldman kept rigorous data on his business. Hope this helped:)
Feldman designed a beautiful economic experiment.
The Microeconomics Theory is a branch of economic science that aims, among other things, to understand the behavior of economic agents: consumers and firms.
From the description of the text, what Feldman did was just that. He developed a methodology capable of analyzing the behavior of firms in certain circumstances. Thus, this can be considered a good economic experiment, since from this can be made inferences that can give the government the basis to take regulatory measures to combat the inappropriate behavior of opportunistic firms.