Lack of historical data on prices fuels debate over whether the mainland market is undergoing a healthy correction or is a bubble about to burst China's real estate market, of which 70 per cent is residential, is too important for the overall economy to be overlooked. Photo: Reuters As China loosens policies to arrest a slowdown in property investment and the broader economy, debate has heated up over whether such efforts will add pressure to a housing market that many have called a bubble.