Black vs. white money

Accumulation of black money is the result of corruption, evasion of taxes and sometime crime. For a capitalist economy this is inevitable. The British empire flourished with the assets plundered from its colonies. So is the case of other colonial powers. The largest economy of the world, the US economy, was founded by slave labourers illegally brought from Africa. Later, the economy flourished on Mafia money lavishly invested in real estate, films and banking sectors. Now all these economies are white.
Corruption in Bangladesh is endemic. Most of the luxurious apartments in Dhanmondi and Gulshan and in other posh areas where many of our leaders, talk show barons and high officials reside were built with black money. Most of them took the benefit of the blanket income tax rule where source was not to be disclosed.
Unless we can enforce taxation rules and anti-corruption laws effectively black money will continue to amass. If we can't divert the same to productive ways these will find way to foreign lands enriching other economies. A reasonable policy should continue to bring the money to legal investment to generate employment and alleviate poverty.
The stick must follow the carrot, otherwise the desired result will not be achieved.