India's demonetisation of Rs. 500 and Rs. 1000 notes
It is hardly going to fix the black money problem. Rich people have so many employees to do the bank run for them. Within the next month, you will see a huge spike in real estate market. People with black money will dump it in the real estate market. (If you are not an Indian, this is how it works. You buy an apartment/home/building for the amount X. But you declare it to the government that you bought it for X/10. The guy who sold it now has the black money which he can reinvest or based on his income level, can deposit in the bank. If he is a farmer, he can pretty much claim it as agricultural income and pay no taxes). So, basically, black money will trickle down rapidly in the next month or so.