Answer
The supply of land is like the Mona Lisa, perfectly inelastic, the drop in prices therefore must be caused by decrease demand for land. We can make the assumption that land rent fell in Japan during the time period of 1990-2001.
Work Step by Step
This question asks you to think of prices and inelasticity. The change could not be caused by a factor in supply because it is inelastic therefore it affects demand.
