Physical Sources

The Physical Sources of any object are the tangible Means of Production for that object.

For instance: the Physical Sources of spaghetti include land, water, seed, energy, compost, tools to {till, sow, reap, grind, mix, press, boil, strain}, plate, fork, salt.

Physical Sources are recursively defined as either:

 The product of other sources

OR

 A finite source.

So, while a tiller is one of the sources of spaghetti, it also has it's own sources:

Tiller: Metal, plastic, tools to shape the metal and plastic, energy, design, plans to make it all come together; gasoline, air and oil to run it, etc.

Metal: Mined ore, tools to smelter, forge, energy, etc.

Mined Ore: Ore, knowledge or magic to find it, tools to mine it, energy, etc.

Ore: Finite

Plastic: Extracted Petrol, Other components of platic, tools to make the liquid, energy, action

Extracted Petrol: Petrol, Tools, energy, plan

Petrol: Finite