FIGURE 16-3 Refer to Figure 16-3. Assume there are two types of firms in this region-beekeepers that produce honey and orchard keepers that produce peaches. The bees provide a benefit to the orchard keepers by pollinating their peach trees. If MB2 represents the social marginal benefit of honey, the external benefit associated with producing one unit of honey is a. $3. b. $4. c. $1. d. $5. e. $2