You have to ask yourself what factors lead to prices increasing over time. In general if people expected something to increase a lot in the future, they would be paying more for it now, so it likely needs to be something that is off people's radars.
Some things that drive prices up:
1) Player making the HOF (particularly for autographs) - Are there any players you anticipate may make the HOF who have been overlooked? Possibly someone in the Negro Leagues?
2) Modern player who performs well beyond expectations - Is there anyone who you really believe in that is not expensive now? Maybe a rookie or young star...
3) Cards or items that are "discovered" - A recent example is the 1925 Exhibits Lou Gehrig which people kind of rediscovered as Gehrig's rookie card and has jumped tremendously. Is there a player or card that is waiting to be (re)discovered?
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