Context: The idea that great powers can shepherd regional actors towards pre-defined goals in Afghanistan is an illusion. There are too many independent actors in the region with high stakes in the country.
Background
Recent tax reforms
Implications of the repeal of retrospective taxation
Conclusion: India cannot grow with a retrogressive tax regime. It needs to be trusted completely on the rule of law. The rule of law will also help privatisation and other associated best practices. This is likely the real reason why the retro tax had to be formally booted out.