What's Really Going On In Labour Markets?

There is so much surrounding wealth gaps, wages, house prices, etc. It's a very morally and politically charged field where it's hard to discern what's actually going on due to the incredible bias of almost everyone involved. As such I would like to navigate

Arts vs STEM

Why are arts subjects (or humanities subjects) considered to be easier than STEM subjects, especially at a university level? The answer is pretty straightforward: it's because they are easier than STEM subjects, at least within the Australian universities. But why is this? Is it that these subjects are