We can find ETF that usually mimick some stock index, for e.g. SP500 has SPDR, Dow Jones Industrial Average has DIA, etc.
Does an ETF that tracks all these indexes exist?
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If the objective is to mimick all the world's equity stock markets in a single ETF there would appear to be 2 choices:
VT which tracks something called FTSE Global All Cap Index with a very low expense ratio
ACWI tracks the MSCI All Country World Index; it is very liquid