 1925 In July 1925 Ernst Wagemann founds DIW Berlin, which is originally called Institute for Business Cycle Research, and becomes the first President.1928 In the context of the Quarterly Journal of Economic Research, Arthur Hanau publishes his dissertation „The phenomenon of cyclical development” and becomes head of the agricultural market research in Germany.Using his concept of the „Pork Cycle“ is still a popular way of explaining students of economics the relationship between demand and supply.