dollar cost averaging - DCA is a popular concept in the financial markets.
but please understand the concept of DCA before applying.
this is only my view -
markets moves in 3 directions - uptrend, sideways/recovery and downtrend.
DCA only works in the uptrend and sidesway/recovery markets and not downtrend market.
try DCA in nikkei market. i don't know how much u have make over here.
China - last 5 years
Long term china will still go up . But how much opportunity have u lost in the last 5 year