Which exposition strategy adds the most value?

Our experiment has answered the question of whether narrative adds measurable value to near-worthless tchotchkes with an emphatic YES. But how does narrative do so? Is every form of narrative exposition, for example, equally effective in encouraging the reader to regard a thrift-store castoff as somehow meaningful?

Apparently not. We've determined that in the 100 stories we published as part of Significant Objects volume 1, three types of exposition are employed. One of these three expository ...