I noticed that in Singapore ETF is very illiquid,
very little volumn, as such the discount/premium will become large.
IS MSCI INDIA 100US$ seems to be the exception, with reasonable volumn.
In US market, the ETF had very high volumn and thus the discount/premium becomes smaller, which means the price of ETF is closer to that of the NAV. BTW, it seems TA worked well for the ETF in US.