Final answer:
Commodore Cornelius Vanderbilt was considered the first 'robber baron' who exploited customers and contributed little to overall economic growth.
Step-by-step explanation:
The first 'robber baron' who exploited customers and contributed little to overall economic growth was Commodore Cornelius Vanderbilt. He was a prominent American industrialist during the 19th century, known for his ruthless business practices in the railroad industry. Vanderbilt focused on maximizing his profits by charging high rates and manipulating transportation costs, often disregarding the welfare of his customers and communities.
Learn more about Robber barons in history