A Costco warehouse in Wisconsin.
The key question Costco CEO Ron Vachris and other experts are weighing is less about whether a strike will occur and more about how long it will last.
  • Eastern US ports could largely halt operations if a maritime workers union goes on strike Tuesday.
  • As the likelihood of a stoppage has increased, retailers like Costco have taken steps to plan ahead.
  • "We've taken as many preemptive measures as we could to prepare," CEO Ron Vachris said last week.

US ports on the East Coast and Gulf Coast could largely come to a halt as soon as Tuesday when the largest union of maritime workers in North America is set to go on strike.

Retailers like Costco have taken steps to plan ahead as the likelihood of a stoppage has increased.