When people talk about preparedness, the conversation tends to become tangible fairly quickly. Food, water, heat, backup power, medical supplies, communications and whatever else might become difficult to obtain if ordinary systems stop working for a while.

I understand the appeal. These are problems you can do something about before the problem exists. You can buy another container of water, fill the fuel cans, test the generator and know that some future inconvenience has become a little easier to absorb.

None of that becomes less useful because an emergency lasts longer. If the power has been out for a week, I'm unlikely to regret having fuel.

What changes with time is the number of problems one person can reasonably prepare to solve alone.

I was reading a discussion about disaster planning recently when someone made a point that stayed with me: if a disruption lasts long enough, who you know may begin to matter as much as what you've stored.

I think that's basically right, although not because relationships somehow replace supplies. My neighbor can't feed me with social capital, and I can't heat his house with goodwill. A generator remains a generator and food remains food.

Relationships provide access to a different kind of capacity.

Maybe I have the generator and somebody else knows how to repair the furnace. Someone has a chainsaw. Someone else knows which road is actually passable. A retired nurse lives three houses away. Another neighbor has been talking to someone across town and knows that power has already returned there, which tells us something about what may be happening here.

No household needs to contain every capability represented by the people around it.

That's ordinary community life, of course. We already depend on other people constantly. Most of the time those relationships are mediated through businesses, utilities, governments and institutions that make the dependency easy to overlook. I don't personally know the people keeping electricity flowing into my house, and under normal conditions I don't need to.

A disruption can make more immediate relationships matter because some of those larger coordination mechanisms become unavailable or unreliable. Now it helps to know who has information, who has equipment, who knows how to fix something and who is likely to answer the phone.

The difficult part is that relationships don't appear as quickly as supplies do.

I can buy a generator this afternoon.

I can't buy ten years of being the neighbor who showed up when somebody needed a hand.

Trust accumulates through ordinary encounters whose future usefulness usually isn't the reason they happened. Someone borrowed a tool and returned it. Somebody checked on an elderly neighbor during a storm. You helped move a piece of furniture. Another person knew how to restart your furnace. People gradually learn who answers, who exaggerates, who knows what they're talking about and who is pleasant enough to spend six hours beside when something has gone badly wrong.

None of this produces a perfectly cooperative community.

People who know one another can distrust one another quite accurately. Rumors can move through established relationships faster than reliable information. Families feud. Neighbors remember old injuries. Communities can become suspicious of outsiders precisely because their internal relationships are strong.

Being connected doesn't guarantee that the network is wise.

It does mean information and assistance have paths along which they can move.

That becomes increasingly useful as the number of problems grows. One person can evaluate a weather report, maintain a generator, watch the roads, check on relatives, cook food before it spoils and figure out why the basement pump stopped working, but attention is finite. If several people are doing those things and talking to one another, nobody necessarily becomes smarter. They simply don't all have to discover the same information independently.

The same applies to material resources. Preparedness discussions sometimes drift toward self-sufficiency, but complete self-sufficiency is an extraordinarily demanding standard. Even someone with substantial food, fuel, tools and technical knowledge eventually depends on things they don't produce themselves: medicine, replacement parts, information, specialized skills or simply another pair of hands.

That doesn't make individual preparation misguided. Quite the opposite. The better prepared each household is for ordinary disruptions, the less immediately it has to draw on everyone around it.

Someone with water doesn't need mine.

Someone with heat doesn't need to sleep in my house.

Someone who can handle the first few days without assistance leaves community capacity available for the person who can't.

Individual preparation and community resilience can reinforce each other.

There is also an important asymmetry between equipment and relationships. Equipment can often be acquired quickly if the market is still functioning. Relationships usually take longer because their useful properties depend partly on history. When circumstances become uncertain, people have less information with which to evaluate unfamiliar offers of help, and established experience becomes one of the signals available to them.

That doesn't mean nobody forms new relationships during emergencies. They do, sometimes remarkably quickly. Shared difficulty can introduce people who had lived near one another for years without ever speaking.

Still, meeting someone during the emergency and already knowing that person when the emergency begins aren't quite the same resource.

This is the preparation that's difficult to put on a checklist because preparing for disaster isn't really the best reason to do it.

Knowing your neighbors is useful when nothing is wrong.

Knowing the person who runs the hardware store is useful even if the grid remains perfectly healthy for the next thirty years. Participating in a volunteer organization, helping somebody with a project, learning which local people know which things and becoming someone other people can reasonably call aren't resources that sit unused while waiting for catastrophe.

They're already part of living somewhere.

That may be why they disappear from preparedness conversations so easily. A shelf of supplies can be identified as preparedness because we bought it for that purpose. A relationship usually wasn't created to survive a storm, even though the relationship may become extremely useful during one.

The longer a disruption continues, the more varied the problems are likely to become. Stored supplies address the problems we anticipated well enough to store something for them. Relationships can sometimes help with the ones we didn't anticipate because another person may possess information, equipment or experience we don't.

Sometimes they won't.

There are failures a community can't solve. A town can cooperate beautifully and still need outside fuel, medicine, electrical equipment or emergency services. Local relationships don't eliminate larger dependencies any more than local servers eliminate the need for the larger networks around them.

Preparedness works at several scales.

A household should be able to absorb some problems without immediate assistance. Neighbors can absorb others together. Local institutions carry capabilities households shouldn't be expected to reproduce. Larger regional and national systems provide resources a town couldn't reasonably maintain for itself.

The mistake is asking any one layer to do all the work.

So I'll keep the food, water, backup power and whatever other supplies make sense for the failures I can reasonably anticipate. Material preparation buys time and reduces the number of things that have to be solved while conditions are already difficult.

I'd add another kind of preparation beside it.

Know some people.

Know who lives nearby. Know who is good at things you aren't. Let other people discover what you're good at too. Be useful occasionally when there is no emergency and no particular advantage in being useful.

Not because those relationships guarantee anyone will come when you need them.

They don't.

They're valuable because no matter how carefully we prepare, eventually something happens that wasn't on the list.

It's useful not to have to encounter every unknown alone.