Bachelors + Masters (MBA) in 5 years?

Some schools offer a Bachelors + Masters in 5-6 consecutive years. (Just 1-2 additional years that come right after the typical 4 years undergrad.)
For example:
Wharton: https://undergrad-inside.wharton.upenn.edu/submatriculation/
Stanford: https://exploredegrees.stanford.edu/cotermdegrees/
Yale: http://catalog.yale.edu/dus/dus-department/simultaneous-award-bachelors-masters/
If I did Bachelor’s in Econ, how helpful would it be to earn an MBA as well? Would this help me get better jobs? The other option is to earn a bachelors in econ, work for 2-5 years, then go back to uni to get an MBA — would it be better/more efficient to just earn a BS and MBA in 5 years?

I’m looking into these type of programs for my 11th grade son. 25 years ago the normal route to an MBA was to work a year or up to three before starting the MBA. However, even then there was a 3-2 MBA program at CMU which my friend was smart enough (among our junior year class at CMU) to get into the program. He got all the same interviews, after his MBA, as the students who worked prior to their MBA. I definitely think it is a good idea.

Back then CMU’s business school was GSIA before Tepper came along.

As an FYI, the Stanford and Yale submatriculations are for an MA or MS degree, not an MBA.

The Wharton submatriculation program, which I believe is unique, is extremely competitive, and only 2-3 people are accepted each year. And even then, the successful applicants will have had significant work experience. But the first hurdle is getting accepted as an undergrad.