Urban development and the case of the Berlin Literature dating back to 1920 has explored urban economics and geography questions. However, it is difficult to find empirical evidence that distinguishes between location decisions driven by agglomeration forces and those driven by location fundamentals. For example, there may be high land prices in urban areas because of Marshallian externalities, or it could be because of attributes such as attractive surroundings or access to water. How convincing do you find the link between real estate prices and agglomeration forces? Do you think it's important to understand both the factors that attract people to cities and the factors that cause barriers to urban growth in order to understand real estate markets? Begin your post with three keywords and a one-sentence summary of your answer.