Hence Coca-Cola can peddle the same sugary syrup for decades, but an oil company has to keep discovering new fields and a pharmaceuticals company must keep refilling its drugs pipeline.

• 因此可口可乐可以连续几十年兜售同一种糖浆，而石油公司则不得不持续勘探新油田，制药公司必须持续更新产品线。