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What can I do when the trading price of a stock or ETF I want to buy is too high?
You have a couple of options: Auto-investing in an open-end mutual fund.  Some companies may waive a minimum if you sign up for an automatic investing, e.g. T. Rowe Price will waive its minimum if you agree to invest $100/month.  There may be some lower ones out there as well. Some brokers like ShareBuilder have programs where someone could auto-invest getting fractional shares with each purchase.  However, something to consider is what percentage is it costing you to buy each time as it may be quite a bit of friction if you are paying $4 a purchase and only buying $40, this is 10% of your investment being eaten up in costs that I'd highly advise taking the first option.