In other words, it may be tough to recoup the rent through crop sales, especially since high-rise crops would compete on the shelf with food that grows on cheap, building-free flatland farms.

换句话说，用卖农产品获得的收益来偿还租金并非易事，特别是因为种植在高层建筑顶层的作物不得不和种植在空旷平原上的作物竞争。