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Stock_Index

Stock Index is a Quotable that represents the spot price of one unit of a given Stock Index Portfolio object expressed in units of a given Currency object.
The constituent stocks are not required as part of the index definition. They are implied by the ticker provided in the given Stock Index Portfolio
The denomination currency must be supplied since the reported index value depends on the chosen currency.
Note you may create a
trivial object of type Stock Index simply through the text: %"ticker|currency|reference currency", like for example "GSPC|USD|EUR".