During a simulation, an iteration occurs every 10 years. Each city has a supply of goods and services which is produced by each urban function it fulfils, and the trade occurs till no more exchanges can be done.
1st step : Compute supply and demand :
2nd step : Compute trade network and trade exchanges (see Rules/Equations)
3rd step : Evaluation of residual supply after the trade exchanges
4 rd step : Compute balance of exchanges then growth (see Rules/Equations)
5 rd step : Compute labor force division (see rules/equations)