Unit cost

Everyone knows that the cost per item comes down as more are produced. One of the things that helps this process is the way income in distributed often shown as quintiles on in 20% groupings. This allows everyone to eventually have access to what only the rich can have in the beginning. TV's were expensive and so only the rich bought them and soon as the price came down the next quintile could buy them and so on. Today we are seeing private citizens going into space at the cost of $250,000 each but in time as more people space travel the price will come down. In the future space trips will become more common.