The question of whether or not to tip can be vexing, particularly when a type of service, like ride-sharing, is relatively new.

The "gig economy" benefits startups and tech companies, but it may be unsustainable, and unethical for the economy, and workers, at large.

Current controversies over ride-sharing apps like Uber and Lyft may not be all that new.

Does self-employment open up new opportunities or exploit a vulnerable workforce?