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It's very true that most electricians and plumbers earn much more than most people with bachelor and masters degree. So many people with degrees aren't necessary today, we need skilled people in trades job.
This is actually the reality, if you're still studying and have a mindset that if you have a degree you would get a high paying job which is ain't true. If you lack the communication skills and having connections then for sure you would be stuck at being unemployed. Just imagine this you're not only the one that are good and talented that attained degree, so you need to build up your social ability to survive the working industry.
Knowledge itself won't do good if you don't have the strategy and hard work to pursue those dreams. I still believe skills is better than knowledge because they are most likely to survive in this industry.