• From here and here you can search and find almost all the available research papers that have been written across the world.

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• From this site you can have access to Economic Data freely available online, while in this one you can find some already build excel spreadsheets. 

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• Wikipedia (yes the famous one)

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• National Bureau of Economic Research (An American, private, non-profit, non-partisan research organization dedicated to promoting a greater understanding of how the economy works).

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• Bank of Greece (The site of the central bank of Greece contains very useful information, datasets, and high-quality research papers).

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• ELSTAT (The Hellenic Statistical Authority is an independent Authority producing and publishing the official national and European statistics of Greece.

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• BIS Statistics (Bank for International Settlements comprises a wide range of data that are compiled in cooperation with central banks and other national authorities, designed to inform analysis of financial stability, international monetary spillovers and global liquidity.