Potatoes and Tomatoes

Peter is a farmer who grows tomatoes. Paul is a farmer who grows potatoes. Peter and Paul work hard and trade with their neighbours for what they need.

Life is good.

When Jethro comes, he asks them to grow more and more tomatoes and potatoes. The people in the city love Peter's tomatoes and Paul's potatoes. But they want so many tomatoes and potatoes that Peter and Paul struggle to keep up. Their little farms can't handle growing the tomatoes and potatoes the city people need.

What will happen when the two farmers stop growing so many extra tomatoes and potatoes?