The last UPS strike in 1997 had far-reaching effects. With the company's operations slowing to a near standstill, other shipping carriers like FedEx Corp. and the U.S. Postal Service struggled to manage the overwhelming package volume. Small businesses, hospitals and various other sectors experienced difficulties in restocking supplies and securing necessary shipments.

Fast forward to 2023, and the potential strike could have even more significant implications, as the U.S. economy is now heavily reliant on e-commerce. Census data shows that e-commerce's share of total retail trade sales has risen significantly, from 1% in 1999 to 15% at the beginning of this year. Data before 1999 is not available.

Experts warn that even a short-lived strike could have immense consequences for consumers. The disruption in UPS's vast delivery network, which handles nearly 25 million packages daily and a quarter of all U.S. parcel volume, will lead to slower delivery times and longer wait periods for customers. Rural areas and smaller retailers, who heavily rely on UPS for their delivery services, will be particularly affected.

Anderson Economic Group estimates that a 10-day UPS strike would cost the economy $7.1 billion in lost wages and production, making it the costliest strike in at least a century. The Biden administration remains hopeful that the collective bargaining process between UPS and the Teamsters will reach a resolution by the end of the month, but the potential impact on businesses and consumers is a cause for concern.

Abe Eshkenazi, CEO of the Association for Supply Chain Management, warns that the weaknesses in the logistics system will become evident if the strike occurs, leading to higher shipping costs, delays and capacity constraints. Small and local business owners who are unable to afford to switch carriers will likely bear the brunt of the disruptions.