Table 1.

Summary table for the variables used in the analysis.

Variable	Unit	Midpoint value	Worst	Best	Reference
	Production/output biomass
Long line	Km per hectare	2.34			Case data.
Production: wet weight	Tons per km long line/year	8	7.5	15	Case data.
Dried seaweed as share of wet weight		0.1789	0.1737	0.1842	Based on 18.5% moisture content in dried product, midpoint of a 15–22% interval, where 15% is considered a conservative lower end of interval and 22% is max recommended36.
Dry weight share of wet weight (i.e. no water at all left)		0.151			37
Production: dried seaweed	Tons per hectare	3.3497	3.1403	6.2806	Calculations from above.
	Financial costs and benefits
Material every year	EUR per 2 ha	31 657	32 126	31 187	Case data.
every 5th year	EUR per 2 ha	7 192	7 192	7 192	Case data.
every 10th year	EUR per 2 ha	46 731	54 240	39 223	Case data.
Labour every year	EUR per 2 ha	54 451	61 653	47 249	Case data.
every 10th year	EUR per 2 ha	6 695	8 123	5 268	Case data.
Energy every year	EUR per 2 ha	1 089	2 119	58	Case data.
Sales value (dried seaweed)	EUR per kg dried seaweed	31	10	52	Conservative estimate based on38–40, and current market price in Sweden. See supplementary material for details.
Productivity growth		2.4%			See supplementary material for details.
		Externalities
N content	Kg per ton dwt	16			5
Economic value of N	EUR per kg N	7.6	3.6	11.5	24,28–31
P content, kilo/ton dry weight	Kg per ton dwt	2.4			5
Economic value of P	EUR per kg P	86.5	0	172.9	28,29
Total recreational values west coast (“Consumer Surplus”)	Thousand EUR	1 805 800			Calculations based on24 and25
Share of Consumer Surplus loss at max potential scale		6%	10%	2%	Assumption.
		Discount rate
Discount rate		4%	6%	2%	Assumption.41