Nativism was a movement of Anti-immigrant and anti-Catholic during the 1830s through 1850. This movement returned during the 1920s after the resolution of the WWI and the rapid growth of political and social problems. This turmoil culminated with the elaboration of the first immigration law entirely based on the basis of race and class, shutting the door to Chinese immigrants for ten years, in 1882. The discriminatory legislation received overwhelming support.
If you have enough supply that exceeds demand then an owner would need to start selling (I forgot the exact word but its something like this) lower then the original price so it gives more incentive for customers to buy from that pizzeria