Reasoning that productivity is determined by the strain of bee, Singapore purchased bees from Inner Mongolia. Lo and behold, honey production shot sharply upward in the very first year. Contrary to expectations, however, honey production then declined beginning from year two, and by year four had fallen to exactly to where it stood before the big bee import.
品種想必決定產量，於是新加坡便以高價向內蒙古購買蜜蜂，養蜂第一年成功了，蜂蜜產量大增，但第二年開始遞減，到第四年，產量下降到和之前一模一樣。