Bank of America Merrill Lynch has looked into filling trucks with cash and sending them over the Greek border so clients can continue to pay local employees and suppliers in the event money is unavailable.

Greece’s abandonment of the euro would most likely create turmoil in global markets, which have experienced periodic sell-offs whenever Europe’s debt problems have flared up over the last two and a half years. It would also increase the pressure on Italy and Spain, much larger economic powers that are struggling with debt problems of their own.

A bank holiday could quickly follow, with the stock market and most local financial institutions shutting down, while new capital controls make it hard to move money in and out of the country.