Why is Mechanical Advantage important?

Mechanical Advantage lets you use a small amount of force to lift a heavy weight. You can not pick up the corner of a car to change the tire. You can use a jack. Mechanical advantage lets you move your arm down several feet to move the jack up a fraction of an inch. By moving your arms many times, you can lift a heavy car. You can change your tire and not be stuck off in the woods, and have to walk several miles to get someone to help you. I think that is important.