If you want to become a street side vendor, you must first get a permit which costs money and are often in limited supply. The reason behind this is because businesses are corrupt and must be limited by the government and permits help protect consumers and don't harm innocent people in any way what-so-ever. At least... that's what you're going to hear from advocates who support vending licenses.
But let's suppose we allow people to sell food from vending carts and stands on the side of the street. What could we expect to see? For one, children wont be shut down by police officers.
Haha I really could imagine a group of 6 year olds being handcuffed with another cop pointing a gun at them cause they are "repeated offenders of the law".