The answer is event.
A BPMN event takes place when a business process progresses.
What is BPMN event?
The Business Process Model and Notation is the graphical depiction of a business process model used to describe business processes (BPMN).
Since the Object Management Group (OMG) and the Business Process Management Initiative (BPMI) amalgamated in 2005, BPMN has been managed by the OMG. BPMN 2.0 was introduced in January 2011; the name was changed to Business Process Model and Notation to emphasize the inclusion of execution semantics in addition to the already existing notational and diagramming features.
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As seen in the chart B has the comparative advantage in coal because 1/3 > 1/5 It means they are better at producing coal than the U.S.Have in mind examples like:
U.S.
1 barrel of oil = 4 hrs
1 ton of coal = 5 hrs
B
1 barrel of oil = 7 hrs
1 ton of coal = 3 hrs
After seeing this we can say that the country which has more availability has a comparative advantage over other countries.
Hope this helps