Before revision:  The results indicate that the added economic value of learning  a new skill strongly depends on the already existing skill bundle but that acquiring a skill from a different domain is often beneficial.
After revision:  The results indicate that the added economic value of learning in-demand skills, such as popular programming languages, is beneficial in general, and that diverse skill sets tend to be profitable, too. However, the economic benefit of a new skill strongly depends on the already existing skill bundle but that acquiring a skill from a different domain is often beneficial.