The article discusses the idea of harmonizing corporate taxes in the EU to reduce tax competition between countries. The main goal is to estimate the welfare gain of this tax harmonization. The researchers suggest that fully harmonizing corporate taxes could lead to a welfare benefit of 0.4% of GDP. However, they also point out that tax competition can be a good thing as it can prevent governments from overtaxing citizens and encourage them to provide high-quality public goods. The researchers argue that the benefits of tax harmonization may not outweigh the costs of giving up tax competition.