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:

Global Economic Prospects

Economic outlook, analysis and forecasts

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