The car rental industry is worth billions of dollars to the world, and it is a sector where there is a huge amount of potential for growth. There are various sectors that rely on the car rental industry for their continued existence, such as airlines and hotels. But, the car rental industry is not the only sector where there is potential for growth; there is also the large opportunity in small car rentals. And, with the prospect of the entrance of self-driving cars into the market, there is even more potential.