The countries around us have more "middle class plus" than before. Just China alone, the "middle class plus" are trying to get their money out of China in a property around the region, be it Hong Kong, Singapore, Malaysia, Thailand, ANZ or Vietnam. The RMB is artificially kept low and these educated "middle class plus" know that keeping their money in RMB or RMB assets is depreciation (unless of course you are talking about high end uptown stuff in Shanghai etc, which these middle class plus cannot afford).
Singapore is always a good choice for them due to a substantial proportion of Chinese in this country.
These "middle class plus" earns easily an equivalent SGD150k to SGD250k per annum. And you can imagine for a big population like China, this "middle class plus" translate into a huge quantitative figure. Not forgetting other countries which are also producing more "middle class plus" like Vietnam, Indonesia, Philippines, Malaysia and Thailand.
If the MIW doesn't implement more ABSD, this growing "middle class plus" will flood the market in Singapore distorting the property prices to a point of no return, to the extent of threatening PAP own political survival. Our own "middle class plus" have been engaging in their 2nd or 3rd property locally too. ABSD and LTV ratio on them is politically correct too.