If you strip down all the modern complications, economy can be summed with this simple premise: We have what the other people want and the other people have what we want
Even human with their allegedly post-scarcity society works under this premise. Though their manufacturing technology allows them to make literally everything, they still need two things: Energy and Instructions.
Energy is freely available to all humans (with some exception such as criminals). Central Authority granted some amount of daily energy to those who are eligible. A moderate usage would only use half of this ration, allowing them to accumulate their energies for creating more elaborate objects in the future.
Now, here's where thing gets complicated. Instructions for some objects like food and clothes are available everywhere for free. Many other instructions, however, requires you to pay to the Instruction Owner (in form of energies obviously). Since you are basically buying the right to make a copy of the object, the payment is called "copyright fee".
So you must be wondering, "What stopped other humans from getting an instruction, duplicate it and give them to other people?
You see, a lot of human made objects have what it's called "signatures" in it. The details and the technology behind it is beyond me, but a signature basically prevents you from using other people devices. Of course, there are some naughty humans who tried to get around this limitation. However, the Instruction Owners always came up with another scheme to counter them.
You should be careful when you're making an object using a pirated instruction. Some of them have been tampered and can injure you.