Its not a market so much as an economy. Instead of necessarily saying "you must do things this way" its "you must meet these requirements and these SLAs/goals/dates, and you have this many Magic Corporate Resource Bucks to spend". Those Magic Corporate Resource Bucks aren't real dollars necessarily, but they are representative of the costs of things that other divisions of the company may provide.
You can swap your MCRBs for real dollars and go out and purchase your own hardware, for example, or do your own service monitoring, or you can "pay" the team that manages hardware to maintain it for you. And the service monitoring team can integrate your project into the company-wide monitoring system. If you do the first option, it might be cheaper, but when things inevitably break, you're the one who takes the blame and has to fix it, instead of having in house experts who fix it.
There's central planning, so you don't have monopoly issues. The hardware provisioning team can't just jack up the price to infinity, because the company can see what the actual cost is and force the team to provide the stuff at cost.
Then you do a little magic like loosely tying bonuses to the amount of MCRBs you receive if your team is an infrastructural one, and perhaps allow management to redeem MCRBs for things like additional capacity to hire employees, and potentially even use MCRB allocation by end users as a way of figuring out what pieces of infrastructure are the highest impact/most in need of additional staffing/etc.
You end up with a system where infra teams have decent incentives to offer good tooling and to fix bugs/implement features (because there's always the looming threat of a client team leaving you and developing their own solution). User facing teams have an incentive to use existing tools and rely on the infrastructure that exists, unless there are compelling reasons not to, but when there are such reasons, they have some level of autonomy to develop unique solutions to fit their needs, and you have indirect, but still useful, signals of where upper management needs to invest additional resources, because something is being used a lot.