A 10-day UPS strike could cost the US economy $7.1 billion. That could make it the costliest work stoppage ever in US history, according to an estimate from a Michigan economic research firm that s...

A 10-day UPS strike could cost the US economy $7.1 billion. That could make it the costliest work stoppage ever in US history, according to an estimate from a Michigan economic research firm that studies the costs of labor disruptions.