In this trading system gold is a actual currency with a specific prize, i do this because gold is next to worthless otherwise, past gold it is just barter

1 gold= 1 coal or 1 log or 1 flint or 1 gravel or 1 sand or 1 dirt or 1 cobblestone or 1 feather or 1 ham (uncooked) or 1 leather or 1 wool or 1 sapling

2 gold= 1 (unsmelted) iron or 1 glass or 1 (cooked) ham or 1 smooth stone or 1 mushroom or 1 string or 1 gunpowder

3 gold = 1 steel or 5 redstone or 4 gold (unsmelted) or 1 bucket of water

4 gold= 1 diamond or 1 bucket of lava

this is my trade system to buy a crafted or smelted item not listed it is minerals to make + 1 gold