What does 2 Kings 7:1 mean?

Elisha replied, 'Listen to what God says: By this time tomorrow, food will be so cheap in Samaria that a big bag of flour or two bags of barley will cost almost nothing at the city gate.' 2 Kings 7:1 - Modern Text Bible

(Elisha promises a sudden, miraculous turnaround, offering hope when things seem absolutely hopeless.)