Mapscript with costs per component and whole value chain

Mapscript with costs per component and whole value chain

Followed https://www.youtube.com/watch?v=i_6bvEfGLD8

Url of resulting wardley map in Mapscript is too long. 
It's https://mapscript.org/nb/#_.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

Short walkthrough demonstrating costs per component and overall chain -> https://www.loom.com/share/84a40edcad4f41dda1572e90688bb276

The code (tabs are important when copying to Mapscript):

cost0 = default 0 usd
cost = cost0 + sum(needs.cost)

staff:
	cost0 = 0.10 usd
	
cup:
	cost0 = 0.05 usd

kettle:
	cost0 = 0.15 usd

tea:
	cost0 = 0.15 usd
	
water:
	cost0 = 0.05 usd

power:
	cost0 = 0.05 usd

public:
	-> cup-of-tea

cup-of-tea:
	-> tea
	-> cup
	-> hot-water
	-> staff
	
hot-water:
	-> water
	-> kettle
	
kettle:
	-> power

public:
	stage = 4
	substage = 0.1

cup-of-tea:
	stage = 3
	
staff:
	stage = 3
	substage = 0.9
	weight = 2
	
cup:
	stage = 4

hot-water:
	stage = 4
	substange = 0.1
	weight = 3
	
kettle:
	stage = 3
	
tea:
	stage = 4
	
water:
	stage = 4
	substage = 0.3
	
power:
	stage = 4