This is a unique reference point, which is based on the Russian Central Bank in determining the rate of the Russian ruble. It is also important to understand which world currency is now a priority: the dollar or the euro. There are only 2 currencies in the basket, hence why it's bi-currency. From 2007 to this day, the currency basket has been composed of 0.45 euros and 0.55 dollars per ruble. Based on these values, the Russian Central Bank exchange rate has been set to prevent an increase in the price of a euro or a strong fall of the dollar. It turns out that this helps to balance the currency basket exchange rate, to restrain inflation and at the same time it doesn't allowing the national currency to appreciate sharply.