What has led to the fact that the topic of services has become the most crucial factor leading to the GDP growth in majority of countries these days?

This explains why in various places like Germany, France, Great Britain and inter alia Poland there is more and more foreign capital invested and the biggest employment contemporarily is observed in the sphere of services. The improving demand for knowledge in the field of finances, various financial instruments, loans etc. makes more and more companies offer such goods that help people invest their funds efficiently.