I am not sure what do you mean by main players?
Since it is the private sector, it is free to play depending on demand and supply.
If you are thinking of developers, there are the big ones like Far East, City Developments, Capital Land etc and many more mid size and small ones.
When demand goes up, developers start building more and more. When the economy is down, and nobody is building will slow down too. In different times, the government as a regulator has come in to try to stimulate the market and at other times introduce cooling measures.
Rgds.
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