Loosely related on the "alternate model", maybe some inspiration from different broker operating models can be used. There are the brokers that operate on a co

Loosely related on the "alternate model", maybe some inspiration from different broker operating models can be used. There are the brokers that operate on a commission basis: you get the exchange price but pay a commission on each trade. And there's the "free" brokers where there's no commission because it's already included in the spread. That is, the price you see is a resell of the original exchange price with broker's markup. I ain't fooled by "free" which can end up more expensive than transparently commissioned but maybe some people are.