... property market. 2 How to improve market transparency Market transparency, market information, Multi criteria decision making, PROMETHEE, key fectors 1 Abstract In the economic research market ... combined to a system to improve nowadays markets transparency. The idea of the empirical study is to identify very important factors (key factor) to describe the land and real estate market. ... fuzzy information to have an idea of market s behavior. However, the German land and real estate market is told to be intransparent. So the aim should be to improve market transparency. Therefore,...