Where in the bible does it tell us the rice of grain and other commodities in end times?

Look at Revelation 6:5-6.

When the Lamb opened the third seal, I heard the third beast say, 'come and see!' I looked, and there before me was a black horse! Its rider was holding a pair of scales in his hand. Then I heard what sounded like a voice among the four beasts, saying, 'A quart of wheat for a day's wages, and three quarts of barley for a day's wages, and do not damage the oil and the wine!