Economic overview 

The Product Manager knows his market data and trends.
Therefore, access to economic overview is obviously important.
The marketer is a treasure hunter. (see this article: what is marketing). To paint the picture of his market , the treasure hunter is collecting qualitative data and quantitative data.

Quantitative information helps to size the markets and their potential evolution.
I usually read economic overview data from those 3 websites:

The World Bank Working for a World Free of Poverty
Global Economic Prospects

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Economic outlook, analysis and forecasts

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Index Mundi  contains detailed country statistics, charts, and maps compiled from multiple sources