It's a misleading way of measuring poverty. In fact, it is irrelevant how many units of currency you earn, as long as your units of currency cover your basic needs plus a bit.

Sixty units of currency are a lot of money when rent costs you ten and bread costs you one.

In Bulgaria, most things are half the price. Food and rent are damn cheap for someone who earns money in euros.

They earn half as many units of currency compared to people where I live. That's an amount of currency with which I could never live where I live now, but there it would last.