Most political parties and views can be identified with an originating group. Whether it's the landed gentry of the Tories or the Unions for Labour, Libertarianism is no different, it has its genesis in the salesman. I say man because I've yet to find a libertarian woman.
Salesmen make nothing, their job is to take something someone else has made and to get somebody else to buy it from them rather than from another salesman.
It is not a job that takes 5 years from start to finish, it's level of planning is not far above zero. If there were no salesmen people would still have to buy things they just would have the time to make a proper decision rather than being badgered by some arrogant git. You only need salesmen because of other salesmen and even then only if your product isn't the best.If we are to be believed then we don't need rules because the best will always win, the market will see to that but the job of the salesman is to make sure that the best product doesn't win. His entire job is to prevent the merits of a product counting for very much.
In a world organised by Libertarians nobody would design or do anything they would be too busy trying to buy things cheap and sell them for a lot.