Field Name: GDP
Definition: Monetary measure of the market value of all the final goods and services produced and sold in a specific time period by a country.
Also known as: Gross domestic product.
Type of value: numbers
#of accepted values: single
Citation Required?: yes.
In order to provide users with comparative analysis tools I suggest using as a citation source either the World Bank (part of the UN institutions) or the International Monetary Fund statistics.
Examples of proper use:
Romania → ‘GDP’ → $ 284,04 billion Citation
Canada → ‘GDP’ → $ 1 988,336 billion Citation
Examples of improper use:
France → ‘GDP’ → $3.667 trillion Citation
In this case Wikipedia is used as a source of citation, which is not a trustworthy source.
Constraints: Only applies when the Subject has the “Is a” value “Country”.
Usage in other schema: Wikidata - GDP