If a long term, well I even a short term event happens, do you have people in your circle, with a variety of skill sets? Because depending on the type and duration of the event, there may come a time that you will need somebodies expertise. Could be in the medical field: doctor,nurse,paramedic, dentist, pharmacist. What about somebody that can fix things: plumber,electrician,mechanic,etc.(If the power goes down indefinitely, you may still need their basic skill sets) Food: farmer,gardener,hunter,fisherman. Alot of people are so dependent on just going to the store or picking up the phone or sending an email for whatever they need, its going to get rough fast, when even doing or providing the most basic thing for themselves and their families.
You should, at least have a mental list of your immediate family,friends,extended family,neighbors,etc.Could you depend on them in a serious crisis?Do you know what skills they possess? When people are desperate,starving,hurting, they will possibly do extreme things to get what they want. It may be a good idea, if you can afford the extra prepping expense, to have barter items on hand or skills to barter for items or other skills your group may need. Again, think back to Katrina, people used that as an excuse to loot businesses( do you remember seeing the video coverage of people running around with arm fulls of electronics or new boxes of namebrand shoes?) Like that was something they needed in an emergency. Do you want to risk going out yourself or sending a family member out to scout for needed items, ie: food,medical,etc. More food for thought and why we need to prep.  Mrs. Prepper