suppose that the external benefit from first-aid training is worth $6. graph the social benefit curve for first-aid training that accounts for the external benefit. instructions: use the tool provides 'social' and plot only the endpoints such that the first point touches the vertical axis and the second point touches the horizontal axis. b. ignoring the social benefits of first-aid training, 10 hours of training will occur. c. the socially optimal quantity of first-aid training is: 14 hours.