Discovery Communications CEO David Zaslav earned $156 million last year — nearly 2,000 times more than the median Discovery worker. Alberto E. Rodriguez/Getty Images for Discovery Communications hide caption

itoggle caption Alberto E. Rodriguez/Getty Images for Discovery Communications

The Securities and Exchange Commission voted 3-2 Wednesday to adopt a rule that would require many public companies to list their chief executives' total annual compensation as a ratio to their workers' median pay. Andrew Harnik/AP hide caption

itoggle caption Andrew Harnik/AP

Members of the Swiss trade union Unia, supporting a referendum to limit the pay of executives to 12 times that of a company's lowest-paid employee, demonstrate in Zurich in August. Arnd Wiegmann/Reuters/Landov hide caption

itoggle caption Arnd Wiegmann/Reuters/Landov

Members of the Swiss trade union Unia, supporting a referendum to limit the pay of executives to 12 times that of a company's lowest-paid employee, demonstrate in Zurich in August. Arnd Wiegmann/Reuters/Landov hide caption

itoggle caption Arnd Wiegmann/Reuters/Landov