For those of us who stay in the Overworld, there are many blocks and items such as Netherrack and Blaze Rods that are unavailable. In addition, there are many Overworld items that are scarce or hard to find. Besides that, there are blocks like bricks and stone bricks that take a lot of time and energy to fabricate.

On the other hand, there are loot items like Name Tags and Horse Armor that may be useless to a player but should have some value.

Merlin’s Forge mods use Gold Dust, Silver Dust and Copper Dust as currency. This make scarce or unreachable blocks/items available for purchase with Merchant Traders or Trading Chests.

This “economy” also establishes a “relative value” structure between different blocks and items.