There have always been stories warning individuals about the lack of impulse control. Remember the story of "The Ant and the Grasshopper"? One worked hard and saved and stored food for the winter; the other ate what it found, sang, and sat idle with nary a thought for the long cold winter ahead.
Using using advance imaging technique they are able to see the differences in the brains of people with delayed gratification and those who have to have things now.
Fortunately, there is good news. People are capable of learning to delay gratification. However, with instant gratification constantly being reinforced through technology, it will be interesting to see how long it will take the next generation to learn to control their spending.