Data Coverage/Looking for Data

Where can I find data for indexes such as the DAX, CAC 40 etc.?
Where can I find data for options or option chains?
Where can I find macroeconomic data such as GDP, PMI, etc.?
Where does Nasdaq Data Link's data come from?
Who provides data on Nasdaq Data Link?
Why can't I subscribe to full history for Zacks data?
Why does Wiki Prices only go up to March 2018?
Why should I choose premium data over free data?

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