The educator is in charge of deciding how the lessons will go. After all, this person has the lesson plans. It’s needed because there is not enough time to talk to students about it.
Second, you have administrative decentralization. It creates different levels of government. You’ll see it in various countries as local and national governments. These include investments and businesses. People could provide each other with goods and services. This creates local institutions. In turn, they could compete with each other for profits.
Some just do their part by holding some coins. Others use their computers to confirm transactions and perform other roles. No matter what, they all have a role.