What underlies the economies of the leading European countries?

Since European countries themselves are no longer rich in resources, the economy is based on the production of products and the improvement of technologies. Therefore, the issue of attracting brains from abroad is especially important for these countries. Also, the countries produce large amounts of electricity and successfully trade with each other. Trade is also an important part of the European economy, and it is for this reason that the countries have merged into the European Union for more successful trade and economic development.