Answer:
There is a verse in Revelation 6 that says: Rev 6:5-6 And when he had opened the third seal, I heard the third beast say, Come and see. And I beheld, and lo a black horse; and he that sat on him had a pair of balances in his hand. And I heard a voice in the midst of the four beasts say, A measure of wheat for a penny, and three measures of barley for a penny; and see thou hurt not the oil and the wine.
This symbolizes famine and a measure was often a day’s ration, with a penny a day’s wages. Otherwise, food will be very expensive and scarce although we cannot tell the exact cost.