Micro/macro economist here. Short answer: If something isn't scarce, the price will be zero. No-one will pay a cent for something freely available. In a scenario like this, enterprising individuals usually find a way to manufacture scarcity by making something unique and fabricating the demand for it. Just look at Coca Cola selling bottled water at $4 a litre or that artist whose name I can't remember selling blank canvases with his signature at $800 per "painting" You can't have a world completely void of scarcity because nothing would happen. You'll either need to manufacture it being creating something available in limited supply, or have an external factor disrupt the means by which scarcity was eliminated.
My suggestion is to make the source code such that it cannot be interpreted by anyone but the creator (or made in a new programming language) and therefor cannot be duplicated by anyone else. This make the item scarce because it can only be duplicated or made by one entity. It's a spin on intellectual property.