Corruption is a habit in few developing countries since British rule.
That is from time even before independence it existed.
The corruption habit has spread into colonies from British rule, and though the British have left them, corruption stayed behind.
Presently corruption is widespread and extended into every walk of life.
There are many anti-corruption bodies to restrict corruption yet the issue seems to be raising severely.
Why Corruption is Necessary
The reason is corruption is not done for daily needs or luxury alone but also an essential thing to survive or keep up jobs and positions.
The small officers need to bribe higher officers to get a promotion. For this these small officers decide to take bribes from the common public. Though not all officers have this type of need. But those officials in medium level or higher have this need.
For example, a police officer needs to bribe higher officials to get control over entire police academy.
A vice-chancellor needs to bribe the official who appoints him. So he takes bribes from those people interested in recruitment within the university.
So the desire to save their careers and get promotions is also the cause of corruption.
In other departments like electricity, health care, water supply. The lower level employees take bribes directly from common man. They do it from hundreds of ordinary men. This is because the money attained from bribes is shared in percentage among all the officials in the department with higher official having a higher share. So there are instances where lower level employees even visit the residence places of common men to collect bribes. Because they face an enormous pressure from higher official to collect the bribes.
In case there is a raid by anti-corruption squad then the lower officials are caught red-handed and then prosecuted while the actual higher rank people are left safe and not pursued.