Эссе на английском для магистратуры

Необходимо написать эссе на английском для поступления на магистра (500 слов)
A few years ago, it was understood that one of the reasons why police officers in Ghana were inclined to accept bribes was that their salary was very low. To solve this problem the salary of police officers was increased and yet after this salary increase police officers became even more corrupt than they had been before. How do you explain such a strange result? (500 words)