No fiduciary responsibility needed, democracy alone is enough to encourage corruption.

For example, a company decision-maker responsible for picking the city/county/country in which their company will put a new factory is in position of great influence on municipal/regional/national level politics - simply because the people want jobs, and politicians want to be popular with the people.

> simply because the people want jobs

To be more precise, the people want to live within a certain standard. I can’t think of anyone¹ who really wants a job. Purpose, something to do, money (which translates to standard of living), recognition, sure, but those don’t really necessitate a job, as in something you have to do on the regular to be able to survive through the indirection of money.

The distinction is important because those who have the power you described are also the ones who have the biggest incentive to perpetuate this notion that everyone needs a job and that there’s no other way the system could work. Thus, by framing it in the context of jobs we’re discussing on their terms and have already lost.

¹ For sure there’ll be someone, but not enough to be meaningful.