Charles Dumas from Lombard Street Research said America's dependency on foreign money would carry a high price.
"The ultimate test will be whether this seriously jeopardizes the reserve currency role of the US dollar. China finances the US government. So as long as the Chinese are willing to accept an annual loss of 15pc on their holdings of US bonds in real yuan terms, this can go on, but the decision lies in Beijing. What is clear is that it will take the US decades to pay this off," he said.
This is the key issue.