Buying shares of an index fund that tracks either one of those indexes, will give you the growth in aggregate of all the companies represented in the fund.
ETF's trade on a stock exchange like individual stocks, so when you buy or
sell shares of an index fund, you incur a standard commission fee.
You just buy
etf shares of index funds as you have the money... Over 25 years the studies typically show you will not lose money.
However, at the least, you can almost certainly set up an auto - invest program that takes $ X out of your bank account every month and
buys shares of some index fund (s).
Trading costs — These are the costs associated with buying more units or
shares of an index fund or ETF.
One of the largest investment houses, Fidelity Investments, is doing their best to grab
a share of the index fund market.
As a result, the market
share of index funds has risen from the low single digits in 1990 to nearly 30 % today.