And I am saying that no changes (law or not) can be effective in fighting corruption as long as the incentives for it are present (broken institutions, culture of accepting bribes, mainly cash economy). Also in the business of government changes are usually implemented through laws. Hence my usage of the term.

Edit: The evidence I provided was that current legal framework is explicit enough in its treatment of corruption and yet corruption is still present which suggests that the problem is not in the rules.

Also, I don't like how you equate parallel economy to black economy. Those are different terms in Economics and the majority of economic transactions outside of regulations and laws are not bribes but a part of the informal sector (grey economy) [1]. And India is considered one of the countries with biggest grey sector in the world [2].

[1] - https://en.wikipedia.org/wiki/Informal_sector

[2] - http://www.ibtimes.com/india-has-second-highest-rate-shadow-...