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system
bucketing investments to track individual growths
user
some personal finance packages can track basis cost of individual purchase lots or fractions thereof. i believe quicken does, for example. and the mutual funds i'm invested in tell me this when i redeem shares. i can't vouch for who/what would make this visible at times other than sale; i've never had that need. for that matter i'm not sure what value the info would have unless you're going to try to explicitly sell specific lots rather than doing fifo or average accounting.
assistant