Research in literature searches to discover items already known. It is limited by the quality of the indexes and the availability of the materials.
Archaeological research is limited by the ability to get to the sites, obtain supplies, staff, and permission to dig.
In other words, as far as any type of research is concerned, money is important.
Also, at some point you reach a point of diminishing returns when the same material keeps reappearing and no new leads appear.
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