Labour is creating wealth
All wealth is created by labor.
The opportunity cost (or alternative cost) is an economic concept that considers the cost of not doing an activity so that to use its resources to achieve another one.
These costs are not counted as such but are taken into account in the decision-making process.
The opportunity cost translates as the company's decision to allocate one available resource to one project rather than another in order to make the best possible gain. In in the example above, if the company decides to assign its production tool to the X model to the detriment of the Y model, and retains the B2 option for some strategic reason, the cost of opportunity is (72-55) € 17 million.
Source and adaptation :
Fred Wilson, Opportunity cost, AVC, 2010
Euro is above all an incredible cement in how countries are functioning, in how economies are functioning.