The Iranian Riyal remains the world’s most worthless currency – with a black market rate of 112,000 to the US Dollar. The Riyal has held this spot for several years running now. The Vietnamese Dong comes in at number 23,800 to the greenback – so a 100,000 Dong note will be worth about 4 dollars, or just under 300 rupees. The Dong has risen to the second position after Venezuela abandoned its old currency (yet again) and went for a new one. Indonesia brings up the third spot – 14,000 Rupiah to the dollar, or 200 of them to the Indian Rupee. Zimbabwe of course, is the record holder in the post World War 2 era, with notes of 100 Trillion Dollars (Zimbabwe) being issued in 2008.