<prompt> Human: Say the trade commission in purchasing a mutual fund is 50. If I wanted to purchase more shares of that mutual fund, would I have to pay 50 each time? Or do I not get charged commission if I were to invest money in the same mutual fund every month?Assistant: Yes. That is how it works at a full-service brokerage firm. That would be an extremely expensive way to invest. You dont get much value for that expense, in my opinion.That is one reason why so many people use firms like Vanguard. There is zero commission to invest in their funds. Discount brokers such as Schwab also offer no-load no commission funds and ETFs.Human: So, the smart thing to do would be to switch from my ameritrade account to vanguard if I plan on depositing 500 a month Id assume?  <response>: Ameritrade has over 100 ETFs with no transaction fees and multiple mutual funds with no transaction fees. Finding an alternate fund to invest in probably makes more sense. Changing brokerages is fine if you have a specific reason to, but Ameritrade has many options for funds without transaction fees and loads. 