"Measuring worth: economic cost 1899 vs 2016". measured using the relative share of the project as a percent of the output of the economy (or share of GDP). Indicates opportunity cost in terms of the total output of the economy to reflect the value to society as a whole. 15 July 2017. Archived from the original on 2016-05-08. Retrieved 15 July 2017.{{cite web}}: CS1 maint: others (link)
"Measuring worth: economic cost 1899 vs 2016". measured using the relative share of the project as a percent of the output of the economy (or share of GDP). Indicates opportunity cost in terms of the total output of the economy to reflect the value to society as a whole. 15 July 2017. Archived from the original on 2016-05-08. Retrieved 15 July 2017.{{cite web}}: CS1 maint: others (link)
