I originally did a BSEE [elect engineering], and went to work for the US Government. After a few years, i noticed that more and more new job applicants were walking in the door with master's degrees fresh out of school - i.e. this was their first full time job after uni. Their jobs were to be principally, if not totally engineering tasks BTW. I asked around a bit in the agency i was with, and was told effectively: "Yeah, you're doing a fine job - but you only have a bachelors........." The implication being that if i wanted to run a 'decent sized project' ["decent sized' at the time being considered 8 million $USD or more, that i would need something better than a BSEE. Armed with this, i went back to uni [at night - whilst working full time], and got my masters. Of course, as other commenters have noted - i was committed to being an engineer. I 'played' at being an 'economist', in that i was doing financial management of $2mUSD projects, but the 'long pole' in my tent was engineering direction of the project. I was working with a 'contracting officer' - who had the 'warrant' [i did not - that is, i could not 'bind the government' - i.e. commit the government to pay money - only he could do that]. He had about 10 of us working for him. He was an economist - not an engineer. He depended upon us to make the engineering decisions.
I found my time doing the masters to be well spent, and after i left the government, i found that it increased my salability as a contractor - but again, i was doing engineering, not economics.
Best of luck!!