I know of Economics ... funny cause less than 20yrs ago no CEO was paid this huge amount in stock value like we're seeing today on top of bonus' - Exxon, Microsoft, etc.
Yes they were paid in huge stocks but the vested value didn't increase so much before having to cash out.
Have a look at Apple's corporate heirarchy structure ... there is so much overlap it's getting ridiculous.
If Jeff Williams is the COO why do we constantly see him marketing the new Apple Watch S3 and S4? This guy earns his pay (
Tim Cook's Tim Cook Fortune Magazine):
2008 - Apple shipped 10 million iPhone's globally.
2015 - Apple shipped 74 million iPhone 6's in 1 quarter alone, COO skills