First principles · The shadow of the future
The last stranger
Honesty with strangers has been enforced by one thing: the chance of meeting again. AI delegates push that chance toward certainty. The places that lived on meeting people once lose their footing, and good behaviour stops telling you who someone is.
deal straight when w × (what trust is worth next time) > what cheating pays today
w is the chance the two of you meet again. Everything else in the deal is the same.
Your tyre is flat on the shoulder of an interstate, four hundred miles from home. The tow truck pulls in, the driver looks at the rim, and names a number. It is high. You both know it is high.
You also both know something else. You will never see each other again. You pay.
Why strangers get the worst price
Picture two people who can each be honest or cheat. If both deal straight, both do well. If one cheats and the other does not, the cheat does best of all and the honest one does worst. If both cheat, both do badly. Played once, the cold arithmetic says cheat: whatever the other side does, you come out ahead by cheating. That is the prisoner’s dilemma, worked out at the RAND Corporation in 1950.
Played again and again, the arithmetic turns over. In 1980 the political scientist Robert Axelrod ran a tournament of computer programs playing the game round after round. The winner was the simplest entry, Anatol Rapoport’s Tit for Tat: be honest first, then do whatever the other side did last time. Axelrod’s explanation fits in one phrase. Cooperation holds when the shadow of the future is long, when the chance of meeting again is high enough that the next deal outweighs today’s gain.
The tow truck driver is not a worse person than your mechanic at home. He is standing in a shorter shadow.
This is why the restaurant by the cathedral can serve a tired sandwich, and the café on your street cannot. Why the airport taxi takes the long way and the driver you call every week does not. Why a locksmith at midnight costs what he costs. These are not mostly stories about character. They are stories about w, the chance of a next time. Wherever people pass through once, the shadow is short, and the arithmetic of the single meeting takes over. Towns, guilds, credit records and review sites were built to lengthen that shadow. Each worked a little.
What AI changes
AI changes one input, and it is the one that matters: the chance of meeting again.
A delegate acting for you does not get tired at 9:40 p.m. It is not four hundred miles from home, because it is not anywhere. It can read the records that tow operator has left before it agrees to a price, and it leaves its own record when the job is done. The driver is no longer dealing with a stranger he will not see again. He is dealing with a party that remembers, carries the memory to the next deal, and sits in front of the next thousand drivers on that road. For him, your flat tyre has stopped being a single meeting and become one round of a long game.
The obvious consequence is that strangers get treated better. That is true, and it is the smaller half.
The larger half is that decency stops being evidence. In a single meeting, honesty had no reward behind it. When a stranger returned your wallet, or a mechanic on a road you would not drive again told you the part was fine, the act said something about the person, because nothing else explained it. That is why we have trusted what people do when no one is keeping score. Once the shadow covers nearly every meeting, almost any decent act can be given a prudent explanation. The good tow driver and the careful one look the same. The cheapest test of character we have ever had, how someone treats a person they will not see again, quietly stops working.
The cost belongs on the table. A world of long shadows is fairer to the traveller and harder on the person who needed to be nobody for a while: the one starting over in a new city, the one who wanted a deal that left no trace. I have written about that loss from the side of memory in Forgetting Was Free. Here it shows up from the side of trust.
Same shoulder, same flat. Before the truck has stopped, your delegate has a price from three operators and the history of each. The one who pulls in quotes what he quoted the last driver and the one before. You barely speak.
Later, he mentions that the spare is worn and you should not trust it past the next town. He did not have to say it. You cannot tell whether he said it for you or for the record, and you notice that you cannot tell.
What I expect
- The tourist trap loses its edge. Places that live on people passing through once, by the airport, the interstate exit, the famous square, will drift toward the price and quality of places that have regulars. Their old advantage was a short shadow, and delegates lengthen it.
- Distress stops being priced. The midnight locksmith, the roadside tow and the emergency plumber have charged partly for your panic. Your panic will still be there. It will no longer be the one negotiating, and the premium that rested on it will shrink to what the hour and the trip cost.
- The stranger gets the regular’s treatment. The quiet favour a shop has kept for people it knows, the honest “you don’t need that”, becomes the default, because most people show up with a memory attached. Being a regular will be worth less, because it will be common.
- Character tests move off the record. When decent behaviour is expected and rewarded nearly everywhere, people trying to judge a partner, a hire or a friend will look for what the record cannot pay for: generosity past the terms of the deal, attention that no one logged, kindness that costs more than any reputation returns. Those acts become the scarce evidence.
- Being a stranger becomes something you buy. Cash once gave this away for free. Expect paid, sanctioned ways to deal without a trace, and expect them to be both a privacy right and a place where the old short-shadow behaviour survives.
Where I am standing
I run Charleston AI from a city where a good share of the people on any downtown street are visiting. I write here daily, and I have handed more and more of my small decisions to my AI with two words, “you decide”, which I wrote about in The Last Line Is You. Most of what I have written about delegates is about what they carry outward for me: my intent, my errands, my patience. This piece is about what they carry back. A delegate that remembers turns the people I deal with into people I will meet again, whether or not I ever come back myself.
The claim, and how it fails
- Already true
- The single meeting has long been where people get the worst deal, and the institutions that lengthened the shadow, from guilds to credit records to reviews, made strangers safer each time they worked.
- What has to happen
- Delegates have to be allowed to carry a record from one deal to the next, across vendors and across towns, and people have to let them negotiate the moments when they are tired, far from home or frightened.
- Where I am probably wrong
- If platforms or privacy rules wall each delegate’s memory inside one company, the shadow stays short and this piece is wrong. I will know by 2029. If the restaurant by the famous square still charges visibly more than the café three streets back for the same plate, and a midnight lockout still costs what panic costs, I was wrong.
Back to the shoulder
You are still on the interstate with a flat tyre and a number that is too high. You pay it, because tonight nothing joins this meeting to the next one. That is the last part of the old world: a stranger’s price, for a stranger’s night.
He is not cheating you. He is only alone with you.
Background
- Robert Axelrod, The Evolution of Cooperation, 1984.
- Robert Axelrod and William D. Hamilton, “The Evolution of Cooperation,” Science, 1981.
- John Rector, Forgetting Was Free.
- John Rector, The Last Line Is You.
Related: The Immutable Past · The Crowd Needs Strangers · Forgetting Was Free