Working multiple jobs isn't all that uncommon, whether you're saving up money, starting your own business, or gaining experience in an unfamiliar industry

"The Elephant and the Flea," Charles Handy, UK professor, speaker, and author, calls doing multiple jobs "the portfolio life."

The book says managing several different roles is about seamlessly blending work and life together. A weekly schedule might be made up of a mix of activities, similar to someone's investment portfolio. Some activities would be for money, some for personal interest, and still others would be to give back to the community.

According to Handy, a portfolio lifestyle will become much more common in the future as people seek a better work and a balanced lifestyle.

Here are some pointers if you're thinking about adding a second or even a third job:

1.It gives job security

If you have two separate jobs (like consulting, or multiple part-time jobs), then your income could be more secure than with just one job. If one company goes out of business, for example, you'll still have income from other work.

2.It pays the bill

One of the most common reason people take on an additional job is the opportunity to increase their income.Basically, second jobs solve money problems. Your first job could take care of your basic needs while your second job can cover your saving goals.

3.It's an added learning experience

As they always say, never stop learning. Working extra will get you to learn an entirely new set of skills, and you can extend your professional network - both of which could further your career at some point. Sometimes, an extra job may turn into something more.

Working two jobs or managing two roles can also be refreshing. You get to see new people and cope with different responsibilities. This means that you'll be less likely to get bored, or overly irritated the little problems go along with everyday work in any workplace.