I think it will be gradual and the powers that be, the governments and the media outlets they control, will hold power over the goods and services of the world as long as possible. Once it is past the point where they can control things, they will be in huge mansions completely off the grid living in paradise hoarding everything they need and want. Oil, drugs, food, water, shelter, all other goods, are for the most part controlled by the people who control just about everything in our society. Once the natural systems that provide us with those things collapse, the rich and powerful will hoard whatever is left. They have most definitely already started.