The third Horseman rides a black horse and is popularly understood to be Famine as the Horseman carries a pair of balances or weighing scales, indicating the way that bread would have been weighed during a famine. Other authors interpret the third Horseman as the “Lord as a Law-Giver” holding Scales of Justice. In the passage, it is read that the indicated price of grain is about ten times normal (thus the famine interpretation popularity), with an entire day’s wages (a denarius) buying enough wheat for only one person, or enough of the less nutritious barley for three, so that workers would struggle to feed their families.
Of the Four Horsemen, the black horse and its rider are the only ones whose appearance is accompanied by a vocal pronunciation. John hears a voice, unidentified but coming from among the four living creatures, that speaks of the prices of wheat and barley, also saying “and see thou hurt not the oil and the wine”. This suggests that the black horse’s famine is to drive up the price of grain but leave oil and wine supplies unaffected (though out of reach of the ordinary worker). One explanation for this is that grain crops would have been more naturally susceptible to famine years or locust plagues than olive trees and grapevines, which root more deeply.
The statement might also suggest a continuing abundance of luxuries for the wealthy while staples, such as bread, are scarce, though not totally depleted; such selective scarcity may result from injustice and the deliberate production of luxury crops for the wealthy over grain, as would have happened during the time Revelation was written. Alternatively, the preservation of oil and wine could symbolize the preservation of the Christian faithful, who used oil and wine in their sacraments. (Source: Wikipedia)