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How can I invest my $100?
Sure. For starters, you can put it in a savings account. Don't laugh, they used to pay noticeable interest. You know, back in the olden days.  You could buy an I-bond from Treasury Direct. They're a government savings bond that pays a specified amount of interest (currently 0%, I believe), plus the amount of the inflation rate (something like 3.5% currently, I believe). You don't get paid the money -- the I-bond grows in value till you sell it. You can open a discount brokerage account, and buy 1 or more shares of stock in a company you like. Discount brokerages generally have a minimum of $500 or so, but will waive that if you set the account up as an IRA. Scot Trade, for instance. (An IRA, in case you didn't know, is a type of account that's tax free but you can't touch it till you turn 59 1/2. It's meant to help you save for retirement.) Incidentally, watch out of "small account" fees that some brokerages might charge you. Generally they're annual or monthly charges they'd charge you to cover their costs on your account -- since they're certainly not going to make it in commissions. That IRA at Scot Trade is no-fee. Speaking of commissions, those will be a big chunk of that $100. It'll be like $7-$10 to buy that stock -- a pretty big bite. However, many of these discount brokerages also offer some mutual funds for no commission. Those mutual funds, in turn, have minimums too, but once again if your account's an IRA many will waive the minimum or set it low -- like $100.