Hey there,   I´ve got a serious problem with demand. I built up a city with a 150k pop. so far. The taxes for $$$ buildings are low while the taxes for $ buildings are way higher. Education is high and i´ve also got enough hospitals. The transit railway system is pretty up-to-date and I´ve also built up suburbal areas around the main city where I try to push $ and $$ buildings (also cumulative population of 150k so the region has currently 300k inhabitants) STILL the demand for $$$ buildings are under zero and I don´t know what to do to make that go up again. Does anyone have a clue what i might be doing wrong?  If anyone has any idea what I can do about this situation plz tell me xD thx