UPS is on the brink of a strike. A 10-day work disruption would be the costliest in modern history.

• A 10-day UPS strike could cost the US economy over $7 billion, according to a new report.
• Customers could face losses of a combined $4.6 billion, which would make the strike the costliest in a century.
• UPS and the Teamsters union representing 340,000 UPS employees have until July 31 to negotiate a new contract.

UPS workers could head to the picket lines in less than two weeks, and their absence would rock the US economy.