Each collective participant can calculate own benefits and compare them with benefits of other participants. Investors, service suppliers and public administrators can control each other while increasing price of owned real estates at local price map of real estates without investing personally. Your house in surrounding of school, park, parking, shop, public transport has higher price then without it in middle of adversary neighbors. You would sell your house only far below cost price with such neighbors. Therefore, you have to care for them, at least by communicating with them. Calculator helps to understanding. Beware that aggressive neighbors are already close.