By similar token government-regulated marketplaces have a long-term problem with corruption.

We already observe the cases where teacher unions sponsor political candidates who will negotiate with teacher unions, police unions approving or disapproving of mayoral candidates who will sit on the opposite side of negotiating table when police contract is being discussed, insurance companies (ahem, industry) supporting (or not) state insurance commissioner candidates, or financial companies paying a bonus to a manager who departs for a government job.

How do you prevent corruption and align incentives properly in a government-run marketplace?