My brother recently sold some of the lego he had as a child, and they went for a lot more than they cost originally, even taking inflation into account.
So, what types of sets have risen in value most over the years?
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The less sets there are available, the better the chances of a rising price. This implies the sets that will get more expensive with time are:
But note that it's never so easy - licensed but small sets for example won't become very expensive as they usually sell very well, so you should look for a set with a combination of this criteria. For example: a very big licensed set like the Millennium Falcon.