The cellular view of a covered market
Thousands of brief, functional exchanges an hour, and almost none of it survives the aisle.
The conditions of this room
Four numbers decide what a crowd does: how tightly it is packed, how loud it is, how fast alcohol arrives, and how much attention is available for the people beside you. Everything below is either a published figure or derived from one.
What those conditions do to people
A market is built for a specific kind of contact: brief, transactional, between a buyer and a seller who will not see each other again. Istanbul's Grand Bazaar takes around 350,000 visitors a day; Chatuchak in Bangkok takes 200,000 on a weekend day.
The physical conditions are unremarkable — 1.3 people per square metre, 80 dB, a 2.1 metre speech range. What defines it is that 60 percent of the crowd is moving through, the highest of any non-transit venue here, and attention sits at 0.50 because half of it is on the stalls.
The model returns the lowest encounter rate of any standing venue at 6.62 per person per hour, and 302 lasting ties. A market moves an enormous amount of human contact per hour and converts almost none of it, which is precisely what it is designed to do.
What the model produces
Measured output from a standard run: 1,200 people, 4 hours of venue time, fixed seed, no parameter overrides. Every room on this site is run under identical conditions, so these figures are a like-for-like comparison rather than a set of individually flattering runs.
The crowd is a simulation and is presented as one. What is not invented are its constants: walking speed against density, the proxemic zones, the collapse of speech range with noise, the Widmark blood-alcohol curve and the conversational group limit all come from published work, cited above and listed in full in the engine.
Real places like this
Every gathering below is modelled as this kind of room. Attendance figures are published numbers for the period stated.
Questions
How many people visit the Grand Bazaar?
Around 350,000 visitors a day, making it one of the most visited attractions in the world.
Why is market contact so brief?
Around 60 percent of the crowd is in transit and half the available attention is on the stalls rather than on other people. Contact is frequent, functional, and almost never lasts.
Are markets social spaces?
In throughput of human contact, extremely. In lasting connection, the lowest of any standing venue modelled here — the two are close to unrelated.
How this is modelled
Each person is one cell with a position, a body mass, a Widmark distribution ratio, an openness trait and a reserve of energy. They walk at the speed the local density allows, drink at the rate the room serves, and when two of them stay within speech range long enough, a bond forms. Most bonds are nothing.
What separates an encounter that creates something from one that does not is whether it bridges two groups that were not previously connected. A tie inside an existing group mostly restates what that group already knows; a tie across a gap carries information neither side had. That distinction is Granovetter's, and it is the mechanic the whole model turns on.
One parameter has no citation and should be read as an assumption: attention, the share of a person available to whoever is beside them rather than to a stage, a road or a rite. It is the variable that separates a street crossing from a dancefloor at similar density, and it is the one this model asserts rather than borrows.