How selfishness catched up!

A farmer imported some specially fine seed corn and produced a crop that was the envy of his neighbours.When they sought some of his seeds,he refused,fearing to lose the competitive advantage he had gained.The second year,his crop was not so good,the third year results were even worse.Suddenly,it dawned upon him that the poor grade corn of his neighbours was pollinating his prize corn.His selfishness had caught up with him

Moral- no need to mention!