但是，尽管它能够解释为何过去三年中资本支出萎靡不振、利率保持低位，但却不能解释为何资本支出不足以防止利率下降超过三十年。
But, though it can explain why capital spending has been weak and interest rates have been low for the last three years, it cannot account for why capital expenditure has been insufficient to prevent rates from trending down for more than three decades.