The book is a frightening read! Another is "The Road," which was also made into a movie.
When law and order break down, and everything that can be looted or stolen has been, starvation follows...and then cannibalism, if history is any guide. Since our food stores normally only have a three-day supply of food on hand, and no deliveries possible to replenish the stock, what will people do? Depending upon how long something like that could last, and depending how prepared you are to weather it, will probably determine your fate. Would our military step in and run things, as they did in Libya and other places? Will everyone at that point be willing to work for food?
During the Y2K scare of 13 years ago, both the government and companies spent millions of dollars to ensure that electronics and computers would still function. In a total collapse, those things would soon be worthless, IMO. Money won't be worth anything, but food and water will, if you have the means to protect what you have, and the knowledge to grow food for future use...including animals. Too many people do not have that knowledge today, I'm afraid. Too easy to stop at McDonalds or Taco Bell when you're hungry.