When productivity increases for all farmland at a point in time, the increased productivity leads to a rise in farmland prices, since more output can be produced on a given amount of land.  But prior to the technological improvements, the productivity of farmland depended mainly on the prevailing weather conditions.  There was little opportunity to substitute land with worse weather conditions for land with better weather conditions.  As technology improved over time, it became much easier to substitute one type of land for another.  So the price elasticity of supply for farmland increased over time, since now land with bad weather is a better substitute for land with good weather.  The increased supply of land reduced farmland prices.  As a result, productivity and farmland prices are negatively related over time.


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楼上那个是权威答案吗？我觉得在技术进步的情况下，气候好的土地跟气候不好的土地的替代性不一定会提高把，因为技术进步同时作用与两者啊。我觉得是不是因为技术进步，所以粮食大丰收，而粮食的需求价格弹性是很小的，所以粮食价格反倒会下降，总收益下降，进而导致土地价格下降。所以技术进步与土地价格反相关