In the 1990s, the US restricted the number of car imports from Japan. As a result, Toyota and Nissan had car quotas. They had luxury cars and mass-market cars. Which do you think they filled their quota with first? Obviously the higher-margin luxury cars. Clearly the problem is not a simple lack of supply, right? Toyota and Nissan just need to make more affordable cars? Or is it obvious that when you restrict supply in a market, only the highest-margin (luxury) goods get produced, until demand for them is met and manufacturers are forced to produce and sell lower-margin mass-market (more affordable) goods?