25 Companies You Could Start Without Quitting Your Day Job By: Elizabeth Cogswell | - In this economy, it's a good idea for every working person to have a small business on the side as a Plan B -- even if you're gainfully employed at a rock-solid company. Just in case your job suddenly went away, you'd already have that Plan B company in place and making a little revenue. You might decide to ramp it up into a full-time endeavor. Or you might just be extra grateful for that non-salary income while you're looking for the next job.