Poland held the third edition of the National Single Market Forum in Krakow on Friday. \"The principles of the European Commission single market should apply equally to all 28 EU member states, irrespective of whether they are or not eurozone members,\" said Michel Barnier, European commissioner for internal market and services, at the forum. Polish Deputy Prime Minister and Economy Minister Janusz Piechocinskiattended the forum. The forum focused on how to create a fully functioning digital single market in e-commerce.