While these cards do provide some measure of flexibility, their ambiguous credit limits create the potential for consumers to exhaust all of their available credit and for cards to be declined unexpectedly.

FORBES: The Pitfalls of No Pre-Set Spending Limit Credit Cards

To put it another way, Italy's potential financing requirements on its own would exhaust the resource of the EFSF, based on its current size, if investors were to shun Italy altogether.

BBC: How ECB failed to reassure investors