不过农夫们因应这种新的市场标志，改种不那么吃水的作物，仍然维持著农田产出的价值稳定，水源生产力甚至翻了两倍。
Yet farmers have responded to the new market signals by switching to less thirsty crops and kept the value of farm output stable. Water productivity has doubled.
来自租户的现金流比来自股票的更稳定，后者的价值每天都在波动，管理层可能会突然停止发放股息。
The cashflow from tenants is more stable than that from equities, where values zigzag day by day and dividends can suddenly be suspended by the management.
PPM开始于有效的项目选择和优先级划分，最终目的是维持对公司稳定的价值回报。
PPM begins with effective project selection and prioritization, with the ultimate goal of sustaining a steady stream of returned value to the company.
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