Firm-product data provide information for various research questions in international trade or innovation economics. However, working with this data requires harmonizing product classifications consistently over time to avoid internal validity issues. The researcher must consider product code...

Firm-product data provide information for various research questions in international trade, industrial or innovation economics. However, working with these data requires harmonizing product classifications consistently over time to avoid internal validity issues. Harmonization is required...

Firm-product data provide information for various research questions in international trade or innovation economics. However, working with this data requires harmonizing product classifications consistently over time to avoid internal validity issues. The researcher must consider product code...