Here's my question. Suppose I invest 100% into the C fund when it's currently going for $15 a share. Next month, it goes up to $16 a share. Am I locked in at the $15 rate for all future purchases? Would I be able to buy x amount of shares still at the original $15 rate? A friend of mine told me you buy shares based on the initial value of what you paid for it. So would I be locked in to purchase shares of the C fund still at $15 per share even though it's worth $16 currently? It seems a little too good to be true..so need to double check with you guys.