Greece has to come up with about 4 billion euros ($4.5 billion) by the end of May for debt payments. Then there’s the 1.5 billion-euro monthly tab for salaries and pensions.
As Prime Minister Alexis Tsipras’s government in Athens haggles over the details of its reforms and leans on its banks to keep buying Treasury bills, the question inevitably looms: what happens if the cash runs out?